Grafana: Updated the Ceph-Cluster variable sorting

Earlier the query used to sort variables in asc alphabetical order,
updated to sort the cluster in desc alphabetical order

Change-Id: I8f08a44b05d0159ad1a043f052751d44b4625f1d

grafana/values.yaml

@@ -4466,7 +4466,7 @@ conf:
           type: query
           query: label_values(ceph_health_status, release_group)
           refresh: 1
-          sort: 1
+          sort: 2
           datasource: prometheus
         - auto: true
           auto_count: 10
@@ -5108,7 +5108,7 @@ conf:
           type: query
           query: label_values(ceph_health_status, release_group)
           refresh: 1
-          sort: 1
+          sort: 2
           datasource: prometheus
         - auto: true
           auto_count: 10
@@ -5635,7 +5635,7 @@ conf:
           type: query
           query: label_values(ceph_health_status, release_group)
           refresh: 1
-          sort: 1
+          sort: 2
           datasource: prometheus
         - auto: true
           auto_count: 10