These were discussed over mail. I am recording the observation to confirm the same after the fixes are done for cleaning the flows.

Used ODL1 for Neutron
ODL2, ODL3 for handling OVS

The following operations were done
Create Networks
Create Instances
Create Router
Delete Instances, Router and Networks
Crearte Networks
Delete Networks

The following flows are left in the control and the compute nodes

Control node
ubuntu@odl-os-control-node:~/devstack$ sudo ovs-ofctl dump-flows br-int -OOpenflow13
OFPST_FLOW reply (OF1.3) (xid=0x2):
cookie=0x0, duration=5533.907s, table=0, n_packets=45, n_bytes=4800, in_port=1,dl_src=fa:16:3e:a1:77:e4 actions=set_field:0x428->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=5197.605s, table=0, n_packets=46, n_bytes=5010, in_port=5,dl_src=fa:16:3e:2c:ed:ef actions=set_field:0x41d->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=408.991s, table=0, n_packets=8, n_bytes=648, in_port=6,dl_src=fa:16:3e:58:85:83 actions=set_field:0x448->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=5479.266s, table=0, n_packets=39, n_bytes=3320, in_port=4,dl_src=fa:16:3e:97:72:fc actions=set_field:0x428->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=7535.170s, table=0, n_packets=10, n_bytes=836, priority=0 actions=goto_table:20
cookie=0x0, duration=408.984s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=6 actions=drop
cookie=0x0, duration=5197.588s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=5 actions=drop
cookie=0x0, duration=5533.904s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=1 actions=drop
cookie=0x0, duration=5479.247s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=4 actions=drop
cookie=0x0, duration=408.785s, table=0, n_packets=0, n_bytes=0, tun_id=0x448,in_port=3 actions=load:0x2->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=5533.387s, table=0, n_packets=48, n_bytes=4136, tun_id=0x428,in_port=3 actions=load:0x2->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=5197.380s, table=0, n_packets=65, n_bytes=5954, tun_id=0x41d,in_port=3 actions=load:0x2->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=7535.170s, table=0, n_packets=1410, n_bytes=157116, dl_type=0x88cc actions=CONTROLLER:65535
cookie=0x0, duration=7535.170s, table=20, n_packets=245, n_bytes=24032, priority=0 actions=goto_table:30
cookie=0x0, duration=409.036s, table=20, n_packets=0, n_bytes=0, priority=1024,arp,tun_id=0x448,arp_tpa=10.11.12.2,arp_op=1 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:58:85:83>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]>NXM_OF_ARP_TPA[],load:0xfa163e588583->NXM_NX_ARP_SHA[],load:0xa0b0c02->NXM_OF_ARP_SPA[],IN_PORT
cookie=0x0, duration=5199.700s, table=20, n_packets=0, n_bytes=0, priority=1024,arp,tun_id=0x41d,arp_tpa=11.12.13.2,arp_op=1 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:2c:ed:ef>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]>NXM_OF_ARP_TPA[],load:0xfa163e2cedef->NXM_NX_ARP_SHA[],load:0xb0c0d02->NXM_OF_ARP_SPA[],IN_PORT
cookie=0x0, duration=5534.079s, table=20, n_packets=2, n_bytes=84, priority=1024,arp,tun_id=0x428,arp_tpa=1.2.3.2,arp_op=1 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:a1:77:e4>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]>NXM_OF_ARP_TPA[],load:0xfa163ea177e4->NXM_NX_ARP_SHA[],load:0x1020302->NXM_OF_ARP_SPA[],IN_PORT
cookie=0x0, duration=7535.170s, table=30, n_packets=245, n_bytes=24032, priority=0 actions=goto_table:40
cookie=0x0, duration=5481.537s, table=40, n_packets=0, n_bytes=0, priority=36001,ip,in_port=4,dl_src=fa:16:3e:97:72:fc,nw_src=1.2.3.3 actions=goto_table:50
cookie=0x0, duration=7535.153s, table=40, n_packets=211, n_bytes=19362, priority=0 actions=goto_table:50
cookie=0x0, duration=5534.165s, table=40, n_packets=8, n_bytes=2704, priority=61012,udp,tp_src=68,tp_dst=67 actions=goto_table:50
cookie=0x0, duration=5533.938s, table=40, n_packets=0, n_bytes=0, priority=61012,udp6,tp_src=546,tp_dst=547 actions=goto_table:50
cookie=0x0, duration=5475.718s, table=40, n_packets=17, n_bytes=1588, priority=61007,ip,dl_src=fa:16:3e:97:72:fc actions=goto_table:50
cookie=0x0, duration=5482.070s, table=40, n_packets=0, n_bytes=0, priority=61011,udp,in_port=4,tp_src=67,tp_dst=68 actions=drop
cookie=0x0, duration=5482.058s, table=40, n_packets=0, n_bytes=0, priority=61011,udp6,in_port=4,tp_src=547,tp_dst=546 actions=drop
cookie=0x0, duration=5482.078s, table=40, n_packets=9, n_bytes=378, priority=61010,arp,arp_sha=fa:16:3e:97:72:fc actions=goto_table:50
cookie=0x0, duration=7535.128s, table=50, n_packets=245, n_bytes=24032, priority=0 actions=goto_table:60
cookie=0x0, duration=7535.096s, table=60, n_packets=240, n_bytes=23542, priority=0 actions=goto_table:70
cookie=0x0, duration=7535.077s, table=70, n_packets=219, n_bytes=21484, priority=0 actions=goto_table:80
cookie=0x0, duration=4341.335s, table=70, n_packets=2, n_bytes=196, priority=1024,ip,tun_id=0x41d,nw_dst=11.12.13.2 actions=set_field:fa:16:3e:2c:ed:ef->eth_dst,goto_table:80
cookie=0x0, duration=7535.055s, table=80, n_packets=245, n_bytes=24032, priority=0 actions=goto_table:90
cookie=0x0, duration=7535.041s, table=90, n_packets=224, n_bytes=21000, priority=0 actions=goto_table:100
cookie=0x0, duration=5476.961s, table=90, n_packets=19, n_bytes=2310, priority=61007,ip,dl_dst=fa:16:3e:97:72:fc actions=goto_table:100
cookie=0x0, duration=5482.133s, table=90, n_packets=0, n_bytes=0, priority=61010,arp,arp_tha=fa:16:3e:97:72:fc actions=goto_table:100
cookie=0x0, duration=5482.149s, table=90, n_packets=0, n_bytes=0, priority=61006,udp6,dl_src=fa:16:3e:a1:77:e4,tp_src=547,tp_dst=546 actions=goto_table:100
cookie=0x0, duration=5482.165s, table=90, n_packets=2, n_bytes=722, priority=61006,udp,dl_src=fa:16:3e:a1:77:e4,tp_src=67,tp_dst=68 actions=goto_table:100
cookie=0x0, duration=7535.028s, table=100, n_packets=223, n_bytes=21876, priority=0 actions=goto_table:110
cookie=0x0, duration=5197.420s, table=110, n_packets=0, n_bytes=0, priority=8192,tun_id=0x41d actions=drop
cookie=0x0, duration=408.840s, table=110, n_packets=0, n_bytes=0, priority=8192,tun_id=0x448 actions=drop
cookie=0x0, duration=5533.420s, table=110, n_packets=0, n_bytes=0, priority=8192,tun_id=0x428 actions=drop
cookie=0x0, duration=7534.465s, table=110, n_packets=11, n_bytes=926, priority=0 actions=drop
cookie=0x0, duration=5533.485s, table=110, n_packets=19, n_bytes=1662, priority=16383,reg0=0x1,tun_id=0x428,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:1,output:3,output:4
cookie=0x0, duration=408.848s, table=110, n_packets=8, n_bytes=648, priority=16383,reg0=0x1,tun_id=0x448,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:6,output:3
cookie=0x0, duration=5533.485s, table=110, n_packets=20, n_bytes=1648, priority=16384,reg0=0x2,tun_id=0x428,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:1,output:4
cookie=0x0, duration=5197.483s, table=110, n_packets=3, n_bytes=230, priority=16383,reg0=0x1,tun_id=0x41d,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:5,output:3
cookie=0x0, duration=5197.528s, table=110, n_packets=32, n_bytes=2876, priority=16384,reg0=0x2,tun_id=0x41d,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:5
cookie=0x0, duration=408.890s, table=110, n_packets=0, n_bytes=0, priority=16384,reg0=0x2,tun_id=0x448,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:6
cookie=0x0, duration=408.901s, table=110, n_packets=0, n_bytes=0, tun_id=0x448,dl_dst=fa:16:3e:58:85:83 actions=output:6
cookie=0x0, duration=5533.546s, table=110, n_packets=33, n_bytes=2900, tun_id=0x428,dl_dst=fa:16:3e:a1:77:e4 actions=output:1
cookie=0x0, duration=4925.573s, table=110, n_packets=25, n_bytes=2901, tun_id=0x41d,dl_dst=fa:16:3e:98:fc:fe actions=output:3
cookie=0x0, duration=5488.134s, table=110, n_packets=27, n_bytes=2932, tun_id=0x428,dl_dst=fa:16:3e:a5:12:bd actions=output:3
cookie=0x0, duration=5479.199s, table=110, n_packets=19, n_bytes=2310, tun_id=0x428,dl_dst=fa:16:3e:97:72:fc actions=output:4
cookie=0x0, duration=5197.556s, table=110, n_packets=33, n_bytes=3078, tun_id=0x41d,dl_dst=fa:16:3e:2c:ed:ef actions=output:5

Compute Node
ubuntu@odl-os-compute-node:~/devstack$ sudo ovs-ofctl dump-flows br-int -OOpenFlow13
OFPST_FLOW reply (OF1.3) (xid=0x2):
cookie=0x0, duration=5011.927s, table=0, n_packets=58, n_bytes=5012, in_port=4,dl_src=fa:16:3e:98:fc:fe actions=set_field:0x41d->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=5574.683s, table=0, n_packets=65, n_bytes=5186, in_port=2,dl_src=fa:16:3e:a5:12:bd actions=set_field:0x428->tun_id,load:0x1->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=6053.783s, table=0, n_packets=16, n_bytes=1519, priority=0 actions=goto_table:20
cookie=0x0, duration=5574.682s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=2 actions=drop
cookie=0x0, duration=5011.912s, table=0, n_packets=0, n_bytes=0, priority=8192,in_port=4 actions=drop
cookie=0x0, duration=5574.365s, table=0, n_packets=44, n_bytes=4454, tun_id=0x428,in_port=1 actions=load:0x2->NXM_NX_REG0[],goto_table:20
cookie=0x0, duration=6053.801s, table=0, n_packets=1417, n_bytes=157287, dl_type=0x88cc actions=CONTROLLER:65535
cookie=0x0, duration=6053.768s, table=20, n_packets=250, n_bytes=24175, priority=0 actions=goto_table:30
cookie=0x0, duration=5578.388s, table=20, n_packets=4, n_bytes=168, priority=1024,arp,tun_id=0x428,arp_tpa=1.2.3.2,arp_op=1 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:a1:77:e4>eth_src,load:0x2->NXM_OF_ARP_OP[],move:NXM_NX_ARP_SHA[]>NXM_NX_ARP_THA[],move:NXM_OF_ARP_SPA[]>NXM_OF_ARP_TPA[],load:0xfa163ea177e4->NXM_NX_ARP_SHA[],load:0x1020302->NXM_OF_ARP_SPA[],IN_PORT
cookie=0x0, duration=6053.760s, table=30, n_packets=250, n_bytes=24175, priority=0 actions=goto_table:40
cookie=0x0, duration=5575.283s, table=40, n_packets=0, n_bytes=0, priority=36001,ip,in_port=2,dl_src=fa:16:3e:a5:12:bd,nw_src=1.2.3.4 actions=goto_table:50
cookie=0x0, duration=5014.818s, table=40, n_packets=0, n_bytes=0, priority=36001,ip,in_port=4,dl_src=fa:16:3e:98:fc:fe,nw_src=11.12.13.3 actions=goto_table:50
cookie=0x0, duration=6053.751s, table=40, n_packets=110, n_bytes=10764, priority=0 actions=goto_table:50
cookie=0x0, duration=5007.285s, table=40, n_packets=33, n_bytes=3156, priority=61007,ip,dl_src=fa:16:3e:98:fc:fe actions=goto_table:50
cookie=0x0, duration=5571.653s, table=40, n_packets=34, n_bytes=3076, priority=61007,ip,dl_src=fa:16:3e:a5:12:bd actions=goto_table:50
cookie=0x0, duration=5575.693s, table=40, n_packets=0, n_bytes=0, priority=61011,udp6,in_port=2,tp_src=547,tp_dst=546 actions=drop
cookie=0x0, duration=5015.114s, table=40, n_packets=0, n_bytes=0, priority=61011,udp,in_port=4,tp_src=67,tp_dst=68 actions=drop
cookie=0x0, duration=5575.693s, table=40, n_packets=0, n_bytes=0, priority=61011,udp,in_port=2,tp_src=67,tp_dst=68 actions=drop
cookie=0x0, duration=5015.093s, table=40, n_packets=0, n_bytes=0, priority=61011,udp6,in_port=4,tp_src=547,tp_dst=546 actions=drop
cookie=0x0, duration=5575.708s, table=40, n_packets=15, n_bytes=630, priority=61010,arp,arp_sha=fa:16:3e:a5:12:bd actions=goto_table:50
cookie=0x0, duration=5015.123s, table=40, n_packets=9, n_bytes=378, priority=61010,arp,arp_sha=fa:16:3e:98:fc:fe actions=goto_table:50
cookie=0x0, duration=6053.743s, table=50, n_packets=250, n_bytes=24175, priority=0 actions=goto_table:60
cookie=0x0, duration=6053.730s, table=60, n_packets=235, n_bytes=22705, priority=0 actions=goto_table:70
cookie=0x0, duration=6053.720s, table=70, n_packets=202, n_bytes=19471, priority=0 actions=goto_table:80
cookie=0x0, duration=4428.209s, table=70, n_packets=2, n_bytes=196, priority=1024,ip,tun_id=0x41d,nw_dst=11.12.13.2 actions=set_field:fa:16:3e:2c:ed:ef->eth_dst,goto_table:80
cookie=0x0, duration=6053.704s, table=80, n_packets=250, n_bytes=24175, priority=0 actions=goto_table:90
cookie=0x0, duration=6053.693s, table=90, n_packets=159, n_bytes=14069, priority=0 actions=goto_table:100
cookie=0x0, duration=5009.131s, table=90, n_packets=35, n_bytes=3881, priority=61007,ip,dl_dst=fa:16:3e:98:fc:fe actions=goto_table:100
cookie=0x0, duration=5572.587s, table=90, n_packets=32, n_bytes=3422, priority=61007,ip,dl_dst=fa:16:3e:a5:12:bd actions=goto_table:100
cookie=0x0, duration=5575.807s, table=90, n_packets=0, n_bytes=0, priority=61010,arp,arp_tha=fa:16:3e:a5:12:bd actions=goto_table:100
cookie=0x0, duration=5015.180s, table=90, n_packets=0, n_bytes=0, priority=61010,arp,arp_tha=fa:16:3e:98:fc:fe actions=goto_table:100
cookie=0x0, duration=5575.833s, table=90, n_packets=0, n_bytes=0, priority=61006,udp6,dl_src=fa:16:3e:a1:77:e4,tp_src=547,tp_dst=546 actions=goto_table:100
cookie=0x0, duration=5575.841s, table=90, n_packets=0, n_bytes=0, priority=61006,udp,dl_src=fa:16:3e:a1:77:e4,tp_src=67,tp_dst=68 actions=goto_table:100
cookie=0x0, duration=6053.685s, table=100, n_packets=210, n_bytes=20255, priority=0 actions=goto_table:110
cookie=0x0, duration=5574.503s, table=110, n_packets=7, n_bytes=518, priority=8192,tun_id=0x428 actions=drop
cookie=0x0, duration=6053.149s, table=110, n_packets=16, n_bytes=1519, priority=0 actions=drop
cookie=0x0, duration=5574.548s, table=110, n_packets=20, n_bytes=1648, priority=16383,reg0=0x1,tun_id=0x428,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:2,output:1
cookie=0x0, duration=5574.548s, table=110, n_packets=17, n_bytes=1522, priority=16384,reg0=0x2,tun_id=0x428,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:2
cookie=0x0, duration=5011.837s, table=110, n_packets=32, n_bytes=2876, priority=16383,reg0=0x1,tun_id=0x41d,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:4
cookie=0x0, duration=5011.851s, table=110, n_packets=0, n_bytes=0, priority=16384,reg0=0x2,tun_id=0x41d,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=output:4
cookie=0x0, duration=5619.306s, table=110, n_packets=22, n_bytes=1900, tun_id=0x428,dl_dst=fa:16:3e:a1:77:e4 actions=output:1
cookie=0x0, duration=5011.880s, table=110, n_packets=35, n_bytes=3881, tun_id=0x41d,dl_dst=fa:16:3e:98:fc:fe actions=output:4
cookie=0x0, duration=5574.608s, table=110, n_packets=32, n_bytes=3422, tun_id=0x428,dl_dst=fa:16:3e:a5:12:bd actions=output:2
cookie=0x0, duration=5565.012s, table=110, n_packets=6, n_bytes=588, tun_id=0x428,dl_dst=fa:16:3e:97:72:fc actions=output:1
cookie=0x0, duration=5283.409s, table=110, n_packets=33, n_bytes=3078, tun_id=0x41d,dl_dst=fa:16:3e:2c:ed:ef actions=output:1