Comment 5 for bug 1810136

Reviewed: https://review.openstack.org/628161
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=0015cc74416445c3cf4e18e566a954f609f7cf0f
Submitter: Zuul
Branch: master

commit 0015cc74416445c3cf4e18e566a954f609f7cf0f
Author: Jose Luis Franco Arza <email address hidden>
Date: Thu Jan 3 13:07:26 2019 +0100

    Gracefully shutdown Mysql before upgrade.

    When upgrading from MySQL 10.1 to 10.3 a bug appears if no
    shutdown is being performed, as the redo log format has
    changed in version 10.3.2 [0].

    Make sure we always stop the MySQL server cleanly before
    upgrading to a new version, to avoid redo log issue.

    Note: to be idempotent, we need to stop the mysql container
    rather than delete it; to be able to stop the container, we
    amend the restart policy of the mysql container.

    [0] - https://jira.mariadb.org/browse/MDEV-14848

    Change-Id: Ia07b7755867858c74c7334424e8e6579ace495db
    Co-Authored-By: Damien Ciabrini <email address hidden>
    Closes-Bug: #1810136