Fix "Restart mariadb-clustercheck container" during config gen

The handler was firing even when we were only generating config.
This is an issue because the services may not have been deployed.

TrivialFix

Change-Id: I2f832d73138b4c9f29e3c71e2463293eab71483a

ansible/roles/mariadb/handlers/main.yml

@@ -105,3 +105,5 @@
     environment: "{{ service.environment }}"
   listen:
     - restart mariadb-clustercheck
+  when:
+    - kolla_action != "config"