Comment 16 for bug 1561046

Reviewed: https://review.openstack.org/299138
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=6dea586906efb1de33c23d5df07ffe12ee7d649b
Submitter: Jenkins
Branch: stable/liberty

commit 6dea586906efb1de33c23d5df07ffe12ee7d649b
Author: Hynek Mlnarik <email address hidden>
Date: Wed Mar 23 14:51:59 2016 +0100

    Remove obsolete keepalived PID files before start

    keepalived refuses to start and claims "daemon already started"
    when there is already a process with the same PID as found in
    either the VRRP or the main process PID file. This happens even
    in case when the new process is not keepalived. The situation
    can happen when the neutron node is reset and the obsolete PID
    files are not cleaned before neutron is started.

    This commit adds PID file cleanup before keepalived start.

    Conflicts:
     neutron/agent/linux/keepalived.py

    Closes-Bug: 1561046
    Change-Id: Ib6b6f2fe76fe82253f195c9eab6b243d9eb76fa2
    (cherry picked from commit e98fabb5836b12bc40a2b64a2668893ea73c2320)