Upgrade data on disk on mariadb major upgrade

Add an ansible task to run mysql_upgrade whenever a container
image upgrade causes a major upgrade of mariadb (e.g. 5.5 -> 10.1)

. If the overcloud was containerized prior to the major upgrade, the
  mysql upgrade job is ran in an ephemeral container (where the latest
  version of mysql comes from) and uses credentials from the Kolla
  configuration.

. Otherwise the upgrade job is run from the host (once the mysql
  rpm has been updated) and uses credentials from the host.

We log the output of the script in the journal. Also, the mysql server
needs to be started temporarily, so use a temporary log file for it
when run from the ephemeral container.

Change-Id: Id330d634ee214923407ea893fdf7a189dc477e5c

docker/services/pacemaker/database/mysql.yaml

@@ -401,3 +401,36 @@ outputs:
             - step|int == 3
             - mysql_containerized|bool
           block: *mysql_fetch_retag_container_tasks
+        - name: Check and upgrade Mysql database after major version upgrade
+          when: step|int == 4
+          block:
+            - name: Mysql upgrade script
+              set_fact:
+                mysql_upgrade_script:
+                  # idempotency: mysql_upgrade leaves a marker file
+                  # in datadir, it does nothing if it has already been
+                  # executed for the current version of MariaDB.
+                  list_join:
+                    - ' '
+                    - - '{% if mysql_containerized %}sudo -E kolla_set_configs; {% endif %}'
+                      - 'mysqld_safe --user=mysql --wsrep-provider=none --skip-networking --wsrep-on=off &'
+                      - 'timeout 60 sh -c ''while ! mysqladmin ping --silent; do sleep 1; done'';'
+                      - 'mysql_upgrade;'
+                      - 'mysqladmin shutdown'
+            - name: Bind mounts for temporary container
+              set_fact:
+                mysql_upgrade_db_bind_mounts: *mysql_volumes
+            - name: Upgrade Mysql database from a temporary container
+              shell:
+                str_replace:
+                  template:
+                    '/usr/bin/docker run --rm --log-driver=syslog -u root --net=host UPGRADE_ENV UPGRADE_VOLUMES "UPGRADE_IMAGE" /bin/bash -ecx "UPGRADE_SCRIPT"'
+                  params:
+                    UPGRADE_ENV: '-e "KOLLA_CONFIG_STRATEGY=COPY_ALWAYS"'
+                    UPGRADE_IMAGE: *mysql_image_pcmklatest
+                    UPGRADE_VOLUMES: "-v {{ mysql_upgrade_db_bind_mounts | union(['/tmp/mariadb-upgrade:/var/log/mariadb:rw']) | join(' -v ')}}"
+                    UPGRADE_SCRIPT: "{{mysql_upgrade_script}}"
+              when: mysql_containerized|bool
+            - name: Upgrade Mysql database from the host
+              shell: /bin/bash -ecx "{{mysql_upgrade_script}}"
+              when: not mysql_containerized|bool