MariaDB: create clustercheck user at container bootstrap

In HA overclouds, the helper script clustercheck is called by HAProxy to poll
the state of the galera cluster. Make sure that a dedicated clustercheck user
is created at deployment, like it is currently done in Ocata.

The creation of the clustercheck user happens on all controller nodes, right
after the database creation. This way, it does not need to wait for the galera
cluster to be up and running.

Partial-Bug: #1707683
Change-Id: If8e0b3f9e4f317fde5328e71115aab87a5fa655f

docker/services/pacemaker/database/mysql.yaml

@@ -32,6 +32,9 @@ parameters:
     type: string
     hidden: true
     default: ''
+  MysqlClustercheckPassword:
+    type: string
+    hidden: true
   RoleName:
     default: ''
     description: Role name on which the service is applied
@@ -118,7 +121,19 @@ outputs:
             image: *mysql_image
             net: host
             # Kolla bootstraps aren't idempotent, explicitly checking if bootstrap was done
-            command: ['bash', '-c', 'test -e /var/lib/mysql/mysql || kolla_start']
+            command:
+              - 'bash'
+              - '-ec'
+              -
+                list_join:
+                  - "\n"
+                  - - 'if [ -e /var/lib/mysql/mysql ]; then exit 0; fi'
+                    - 'kolla_start'
+                    - 'mysqld_safe --skip-networking --wsrep-on=OFF &'
+                    - 'timeout ${DB_MAX_TIMEOUT} /bin/bash -c ''until mysqladmin -uroot -p"${DB_ROOT_PASSWORD}" ping 2>/dev/null; do sleep 1; done'''
+                    - 'mysql -uroot -p"${DB_ROOT_PASSWORD}" -e "CREATE USER ''clustercheck''@''localhost'' IDENTIFIED BY ''${DB_CLUSTERCHECK_PASSWORD}'';"'
+                    - 'mysql -uroot -p"${DB_ROOT_PASSWORD}" -e "GRANT PROCESS ON *.* TO ''clustercheck''@''localhost'' WITH GRANT OPTION;"'
+                    - 'timeout ${DB_MAX_TIMEOUT} mysqladmin -uroot -p"${DB_ROOT_PASSWORD}" shutdown'
             volumes: &mysql_volumes
               list_concat:
                 - {get_attr: [ContainersCommon, volumes]}
@@ -131,6 +146,12 @@ outputs:
               - KOLLA_BOOTSTRAP=True
               # NOTE(mandre) skip wsrep cluster status check
               - KOLLA_KUBERNETES=True
+              - DB_MAX_TIMEOUT=60
+              -
+                list_join:
+                  - '='
+                  - - 'DB_CLUSTERCHECK_PASSWORD'
+                    - {get_param: MysqlClustercheckPassword}
               -
                 list_join:
                   - '='