EDGEPOD-34 Add ability to configure Grafana dashboards to import

Also, bump Prometheus and Grafana helm chart version.

Change-Id: I74ab2f8d70671fa3ccaf2efab2de107c0c5d47b5
diff --git a/nem-monitoring/grafana-dashboards/voltha-kpi.json b/nem-monitoring/grafana-dashboards/voltha-kpi.json
index b76bb2f..9d59d57 100644
--- a/nem-monitoring/grafana-dashboards/voltha-kpi.json
+++ b/nem-monitoring/grafana-dashboards/voltha-kpi.json
@@ -1072,7 +1072,9 @@
   "refresh": "15s",
   "schemaVersion": 16,
   "style": "dark",
-  "tags": [],
+  "tags": [
+    "seba"
+  ],
   "templating": {
     "list": [
       {