Add missing service.grafana.collector class

Change-Id: If3ce7f727353085e4f931eac01b5d3c052424c7c
diff --git a/classes/cluster/virtual-mcp11-contrail/init.yml b/classes/cluster/virtual-mcp11-contrail/init.yml
index dbcb6d4..9a5b947 100755
--- a/classes/cluster/virtual-mcp11-contrail/init.yml
+++ b/classes/cluster/virtual-mcp11-contrail/init.yml
@@ -1,4 +1,5 @@
 classes:
+- service.grafana.collector
 - system.heka.log_collector.single
 - system.linux.system.repo.mcp.extra
 - system.linux.system.single