Use 'openstack' in Grafana dashboard tags

Change-Id: Ifffd157ebe87a3817ad5d806fc9359b0fac9f5e4
Related-Bug: PROD-17781
diff --git a/keystone/files/grafana_dashboards/keystone_prometheus.json b/keystone/files/grafana_dashboards/keystone_prometheus.json
index 6d64799..c2d08d6 100755
--- a/keystone/files/grafana_dashboards/keystone_prometheus.json
+++ b/keystone/files/grafana_dashboards/keystone_prometheus.json
@@ -993,7 +993,9 @@
   "schemaVersion": 14,
   "sharedCrosshair": true,
   "style": "dark",
-  "tags": [],
+  "tags": [
+    "openstack"
+  ],
   "templating": {
     "list": [
       {
diff --git a/keystone/files/grafana_dashboards/keystone_prometheus_fluentd.json b/keystone/files/grafana_dashboards/keystone_prometheus_fluentd.json
index 7acd716..eb6262e 100755
--- a/keystone/files/grafana_dashboards/keystone_prometheus_fluentd.json
+++ b/keystone/files/grafana_dashboards/keystone_prometheus_fluentd.json
@@ -993,7 +993,9 @@
   "schemaVersion": 14,
   "sharedCrosshair": true,
   "style": "dark",
-  "tags": [],
+  "tags": [
+    "openstack"
+  ],
   "templating": {
     "list": [
       {