Always run mysql init bundle

This init container runs docker-puppet manually and is responsible of
provisioning the mysql users and passwords. This currently doesn't get
ran every time since the configuration stays the same, even if the users
or passwords change (which are gotten from hieradata). Allowing this to
run every time will allow us to change database passwords

Closes-Bug: #1762991
Change-Id: I1f07272499b419079466cf9f395fb04a082099bd

docker/services/pacemaker/database/mysql.yaml

@@ -55,6 +55,12 @@ parameters:
     default: false
     description: Whether to run config management (e.g. Puppet) in debug mode.
     type: boolean
+  DeployIdentifier:
+    default: ''
+    type: string
+    description: >
+      Setting this to a unique value will re-run any deployment tasks which
+      perform configuration on a Heat stack-update.
 
 resources:
 
@@ -262,6 +268,13 @@ outputs:
                 - - /etc/corosync/corosync.conf:/etc/corosync/corosync.conf:ro
                   - /dev/shm:/dev/shm:rw
                   - /var/lib/mysql:/var/lib/mysql:rw
+            environment:
+              # NOTE: this should force this container to re-run on each
+              # update (scale-out, etc.)
+              - list_join:
+                  - ''
+                  - - 'TRIPLEO_DEPLOY_IDENTIFIER='
+                    - {get_param: DeployIdentifier}
       host_prep_tasks:
         - name: create persistent directories
           file: