Bug 1615821

Description of problem:
two CSIT tests from VPN basic ipv6 suite fail with same error

tests:
Check L3_Datapath Traffic Across Networks With Router
Verify L3VPN Datapath With Router Association

StackTrace:
Keyword 'VpnOperations.Verify GWMAC Flow Entry On Flow Table' failed after retrying for 30 seconds. The last error was: ' cookie=0x4000000, duration=871.473s, table=45, n_packets=0, n_bytes=0, priority=50,icmp6,metadata=0x1780000000/0xffff000000,icmp_type=135,icmp_code=0,nd_target=2001:db8:0:2::1 actions=CONTROLLER:65535
 cookie=0x4000000, duration=871.473s, table=45, n_packets=2, n_bytes=172, priority=50,icmp6,metadata=0x1780000000/0xffff000000,icmp_type=135,icmp_code=0,nd_target=fe80::f816:3eff:fe70:508d actions=CONTROLLER:65535
 cookie=0x6900000, duration=871.472s, table=210, n_packets=8, n_bytes=672, priority=63010,icmp6,metadata=0x19bc0000000000/0xfffff0000000000,icmp_type=135,icmp_code=0 actions=resubmit(,17)
 cookie=0x6900000, duration=871.472s, table=240, n_packets=10, n_bytes=844, priority=63010,icmp6,reg6=0x19bc00/0xfffff00,icmp_type=135,icmp_code=0 actions=resubmit(,220)' does not match 'icmp_type=135,icmp_code=0,nd_target=2001:db8:0:3::1 actions=CONTROLLER:65535'


it looks like 2001:db8:0:3::1 is expected by the csit test but the flow contains: nd_target=2001:db8:0:2::1


Version-Release number of selected component (if applicable):
opendaylight-8.3.0-3
puddle 2018-08-08.2


How reproducible:
it appeared only once in all 8 runs of CI with opendaylight-8.3.0-3, hard to determine the % of occurence



Steps to Reproduce:
1. deploy tripleo with odl
2. run csit testsuites as per d/s CI (see attached Report HTML)
3.

Actual results:
the 2 tests fail

Expected results:
the 2 tests to pass as per usual

Additional info: