Deleted Network flow entries retained in br-int,if network associated and disassociated from virutalrouter interface

Build#: Lithium-SR1 Build
Openstack: stable/kilo

local.conf snip
=======
enable_plugin networking-odl https://github.com/stackforge/networking-odl stable/kilo
Q_PLUGIN=ml2
ENABLE_TENANT_TUNNELS=True
Q_ML2_TENANT_NETWORK_TYPE=vxlan

Scenario:
==========
1.Create Network (e.g 7.1.1.0/24) on openstack
2.Create Virtual Router and assign step-1 network(i.e 7.1.1.0/24) to Router Interface
3.Verify the br-int OF flow entries
4.Delete 7.1.1.0/24 association from Router Interface
5.Verify the br-int OF flow entries [you can see stale OF entries of step-2]
6.Delete 7.1.1.0/24 Network itself.
7.Verify the br-int OF Flow entries [still OF stale entries present]

Stale Entries snip
====================
cookie=0x0, duration=241.782s, table=20, n_packets=0, n_bytes=0, priority=1024,arp,tun_id=0x43f,arp_tpa=7.1.1.2 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:42:7d:66>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:0xfa163e427d66->NXM_NX_ARP_SHA[],load:0x7010102->NXM_OF_ARP_SPA[],IN_PORT
cookie=0x0, duration=241.833s, table=70, n_packets=0, n_bytes=0,
priority=1024,ip,tun_id=0x43f,nw_dst=7.1.1.2 actions=set_field:fa:16:3e:42:7d:66->eth_dst,goto_table:80

--Attached br-int flows