Add support for Grafana

This patch enables support for Grafana and provide a dashboard for
Glance.

Change-Id: I3980931e8a8b198e1f772cc30a2fe533b02efefe
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index a1e8cab..06f1456 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -11,3 +11,5 @@
         enabled: true
       config:
         enabled: true
+      grafana:
+        enabled: true