Comment 9 for bug 1613724

Reviewed: https://review.openstack.org/420047
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=73599f5f44f6849c0d47639124a091824a21a543
Submitter: Jenkins
Branch: stable/newton

commit 73599f5f44f6849c0d47639124a091824a21a543
Author: Igor Gajsin <email address hidden>
Date: Mon Dec 26 13:32:38 2016 +0300

    Restart neutron services on neutron config change

    There are many neutron tasks, e.g.: common-config and network-plugins-l2.
    Normally the common-config configures neutron.conf and then plugns-l2 starts
    the ovs-agent.

    But there is the wrong behaviour when new controllers are added to an
    environment:
      1. configure and deploy an env.
      2. common-config configures neutron.conf
      3. plugins-l2 starts ovs-agent.
      4. add new controllers to the env and redeploy it.
      5. common-config configures neutron.conf.
      6. plugins-l2 knows nothing about changes in the config.

    So ovs-agent isn't restarted and works with old configuration data.

    This commit makes neutron tasks check md5 hash of neutron.conf and
    restart them when config is changed.

    (cherry-picked from 5912ee7ea5715f17f2188c3eb9c814867c9af571)
    Change-Id: Ia26f4a5105407ce322a5185455093d69a938edfc
    Closes-bug: #1613724