LIngering flows after Neutron net, subnet and VMs deleted

[jhershbe@control devstack]$ sudo ovs-ofctl -OOpenFlow13 dump-flows br-int
OFPST_FLOW reply (OF1.3) (xid=0x2):
cookie=0x8040000, duration=160.220s, table=17, n_packets=0, n_bytes=0, priority=6,metadata=0xc000010000000000/0xffffff0000000000 actions=write_metadata:0xe000011388000000/0xfffffffffffffffe,goto_table:50
cookie=0x8040000, duration=148.148s, table=17, n_packets=29, n_bytes=2106, priority=6,metadata=0xc000020000000000/0xffffff0000000000 actions=write_metadata:0xe000021388000000/0xfffffffffffffffe,goto_table:50
cookie=0x8040000, duration=138.743s, table=17, n_packets=29, n_bytes=2106, priority=6,metadata=0xc000030000000000/0xffffff0000000000 actions=write_metadata:0xe000031388000000/0xfffffffffffffffe,goto_table:50
cookie=0x6800000, duration=356.795s, table=18, n_packets=0, n_bytes=0, priority=0 actions=goto_table:38
cookie=0x6800000, duration=356.817s, table=19, n_packets=59, n_bytes=4282, priority=0 actions=resubmit(,17)
cookie=0x6900000, duration=366.835s, table=40, n_packets=0, n_bytes=0, priority=0 actions=drop
cookie=0x6900000, duration=366.835s, table=41, n_packets=0, n_bytes=0, priority=0 actions=drop
cookie=0x4000000, duration=359.730s, table=45, n_packets=0, n_bytes=0, priority=0 actions=resubmit(,17)
cookie=0x8050000, duration=357.104s, table=50, n_packets=0, n_bytes=0, priority=0 actions=CONTROLLER:65535,goto_table:51
cookie=0x8030000, duration=357.086s, table=51, n_packets=31, n_bytes=1734, priority=0 actions=goto_table:52
cookie=0x6900000, duration=366.835s, table=251, n_packets=0, n_bytes=0, priority=0 actions=drop
cookie=0x6900000, duration=366.835s, table=252, n_packets=0, n_bytes=0, priority=0 actions=drop