Comment 4 for bug 1768990

Reviewed: https://review.openstack.org/566178
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=85b46cd51ebec67d5018d8bef4f796ee5ef4fedf
Submitter: Zuul
Branch: master

commit 85b46cd51ebec67d5018d8bef4f796ee5ef4fedf
Author: Sławek Kapłoński <email address hidden>
Date: Fri May 4 00:12:03 2018 +0200

    Monitor phys_bridges to reconfigured it if created again

    In case when external bridge configured in OVS agent's bridge_mappings
    will be destroyed and created again (for example by running ifup-ovs
    script on Centos) bridge wasn't configured by OVS agent.
    That might cause broken connectivity for OpenStack's dataplane if
    dataplane network also uses same bridge.

    This patch adds additional ovsdb-monitor to monitor if any
    of physical bridges configured in bridge_mappings was created.
    If so, agent will reconfigure it to restore proper openflow rules
    on it.

    Change-Id: I9c0dc587e70327e03be5a64522d0c679665f79bd
    Closes-Bug: #1768990