Add telegraf inputs for keepalived

Change-Id: I99bc7c2a12cee0c31bd79dfefd447254aba52c53
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 8bcddf3..90d9649 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -9,3 +9,5 @@
         enabled: false
       sphinx:
         enabled: true
+      telegraf:
+        enabled: true