The case when floating IP is reassociated from one VM to another
on the same host without doing disassociation, was not properly handled:
l3 dvr agent only checked that the floating address was present on the
device in router namespace and considered floating IP confiigured correctly.
This patch adds fip_mapping to router object so fixed IP change can be
detected and handled.
Closes-Bug: #1599089
(cherry picked from commit b8a2cb8132)
Conflicts:
neutron/tests/functional/agent/l3/test_dvr_router.py
Change-Id: I25c23bb9ad7b9a9b90f225f37417142e2304deb8
251d6803eb