Comment 3 for bug 1859145

Reviewed: https://review.opendev.org/701010
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=9f14ad651a9e6516d02c90d9eb0ec4b7a4702e7e
Submitter: Zuul
Branch: master

commit 9f14ad651a9e6516d02c90d9eb0ec4b7a4702e7e
Author: Radosław Piliszek <email address hidden>
Date: Fri Jan 3 11:20:00 2020 +0100

    Fix multiple issues with MariaDB handling

    These affected both deploy (and reconfigure) and upgrade
    resulting in WSREP issues, failed deploys or need to
    recover the cluster.

    This patch makes sure k-a does not abruptly terminate
    nodes to break cluster.
    This is achieved by cleaner separation between stages
    (bootstrap, restart current, deploy new) and 3 phases
    for restarts (to keep the quorum).

    Upgrade actions, which operate on a healthy cluster,
    went to its section.

    Service restart was refactored.

    We no longer rely on the master/slave distinction as
    all nodes are masters in Galera.

    Closes-bug: #1857908
    Closes-bug: #1859145
    Change-Id: I83600c69141714fc412df0976f49019a857655f5