Use 'openstack' in Grafana dashboard tags

Change-Id: Ifd2b2094b61745c026515635ff880088cb8b0e01
Related-Bug: PROD-17781
diff --git a/nova/files/grafana_dashboards/hypervisor_prometheus.json b/nova/files/grafana_dashboards/hypervisor_prometheus.json
index f564bd9..7465b00 100644
--- a/nova/files/grafana_dashboards/hypervisor_prometheus.json
+++ b/nova/files/grafana_dashboards/hypervisor_prometheus.json
@@ -1106,7 +1106,8 @@
   "style": "dark",
   "tags": [
     "hypervisor",
-    "nova"
+    "nova",
+    "openstack"
   ],
   "templating": {
     "list": [
diff --git a/nova/files/grafana_dashboards/nova_prometheus.json b/nova/files/grafana_dashboards/nova_prometheus.json
index 2e6a249..0b6c26a 100644
--- a/nova/files/grafana_dashboards/nova_prometheus.json
+++ b/nova/files/grafana_dashboards/nova_prometheus.json
@@ -3681,7 +3681,7 @@
   "sharedCrosshair": true,
   "style": "dark",
   "tags": [
-    "nova"
+    "openstack"
   ],
   "templating": {
     "list": [
diff --git a/nova/files/grafana_dashboards/nova_prometheus_fluentd.json b/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
index 376f091..411cbc8 100644
--- a/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
+++ b/nova/files/grafana_dashboards/nova_prometheus_fluentd.json
@@ -3505,7 +3505,7 @@
   "sharedCrosshair": true,
   "style": "dark",
   "tags": [
-    "nova"
+    "openstack"
   ],
   "templating": {
     "list": [