Environment Details:
OpenStack Version: stable/ocata
ODL Version: carbon-FR + L2GW related patches
ODL MAX heap: JAVA_MAX_MEM="6144m"

Issue:
　Flows of created NWs are deleted one flow at a time when creating new NW after 1000 NWs were created.
　These deleted flows are flows in Controller Node.
　Below is an exmaple of deleted flow:
cookie=0x8800001, table=55, priority=10,tun_id=0x1,metadata=0x10000000000/0xfffff0000000000 actions=drop

Detailed Phenomenon:
1st NW Creation: Flows of the 1st NW are successfully registered in br-int (controller node)
2nd NW Creation: Flows of the 2nd NW are successfully registered in br-int
. .
. .
. .
999th NW Creation: Flows of the 999th NW are successfully registered in br-int
1000th NW Creation: Flows of the 1000th NW are successfully registered in br-int
1001th NW Creation: Flows of the 1001th NW are successfully registered in br-int
one flow of the 1st NW is deleted
1002th NW Creation: Flows of the 1002th NW are successfully registered in br-int
one flow of the 2nd NW is deleted
: :
1010th NW Creation: Flows of the 1010th NW are successfully registered in br-int
one flow of the 10th NW is deleted

1. confirmed until the 1010th NW creation

Attachment:
ovs.tar.gz ovs information (executed after the 1st, 2nd, 999th, 1000th, 1001th and 1002th NW creation)
ovs-vsctl show
ovs-ofctl -Oopenflow13 dump-flows br-int
ovs-ofctl -Oopenflow13 show br-int
ovs-ofctl -Oopenflow13 dump-groups br-int
xaa - xak ODL logs (splited)