Add Telegraf support for OpenStack services

Change-Id: Ib52bd7fe86800b974f120e24671a4745803e249e
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index df136a7..25c2402 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -13,3 +13,5 @@
         enabled: true
       grafana:
         enabled: true
+      telegraf:
+        enabled: true