add helm-tiller as addon

Change-Id: If55918227e84d128229bdaf83291e3688a633848
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index beb7bd2..e500b66 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -39,6 +39,9 @@
           enabled: True
         heapster_influxdb:
           enabled: False
+        helm:
+          enabled: False
+          tiller_image: gcr.io/kubernetes-helm/tiller:v2.2.3.
       token:
         admin: ${_param:kubernetes_admin_token}
         kubelet: ${_param:kubernetes_kubelet_token}