Move grafana to login node

Author: m-bull

group_vars/openstack.yml

@@ -32,7 +32,7 @@ cluster_groups_required:
 cluster_groups_monitoring:
   podman:        [opendistro, filebeat]
   prometheus:    [control]
-  grafana:       [control]
+  grafana:       [login]
   alertmanager:  [control]
   node_exporter: [cluster]
   opendistro:    [control]