update version of tiller to verified stable

Change-Id: I5810f1851caa00c429741035f021a348d3d1f6b5
diff --git a/metadata/service/common.yml b/metadata/service/common.yml
index bad9c19..8b1052c 100644
--- a/metadata/service/common.yml
+++ b/metadata/service/common.yml
@@ -25,7 +25,7 @@
           enabled: False
         helm:
           enabled: False
-          tiller_image: gcr.io/kubernetes-helm/tiller:v2.3.0
+          tiller_image: gcr.io/kubernetes-helm/tiller:v2.4.2
         netchecker:
           enabled: False
           interval: 60
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index 5133b5d..61464f7 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -49,7 +49,7 @@
           enabled: False
         helm:
           enabled: False
-          tiller_image: gcr.io/kubernetes-helm/tiller:v2.3.0
+          tiller_image: gcr.io/kubernetes-helm/tiller:v2.4.2
         calico_policy:
           enabled: False
           image: calico/kube-policy-controller:v0.5.4