Comment 16 for bug 1818614

Reviewed: https://review.openstack.org/643461
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=91c26f56586e88a75e942cd06c8f4539acfb4963
Submitter: Zuul
Branch: stable/pike

commit 91c26f56586e88a75e942cd06c8f4539acfb4963
Author: Slawek Kaplonski <email address hidden>
Date: Sun Mar 10 22:45:15 2019 +0100

    Set initial ha router state in neutron-keepalived-state-change

    Sometimes in case of HA routers it may happend that
    keepalived will set status of router to MASTER before
    neutron-keepalived-state-change daemon will spawn "ip monitor"
    to monitor changes of IPs in router's namespace.

    In such case neutron-keepalived-state-change process will never
    notice that keepalived set router to be MASTER and L3 agent will
    not be notified about that so router will not be configured properly.

    To avoid such race condition neutron-keepalived-state-change will
    now check if VIP address is already configured on ha interface
    before it will spawn "ip monitor". If it is already configured
    by keepalived, it will notify L3 agent that router is set to
    MASTER.

    Change-Id: Ie3fe825d65408fc969c478767b411fe0156e9fbc
    Closes-Bug: #1818614
    (cherry picked from commit 8fec1ffc833eba9b3fc5f812bf881f44b4beba0c)