Merge pull request #8471 from govargo/bump-helm-2.16.8

bump helm-tiller addon to v2.16.8

Author: medyagh

deploy/addons/helm-tiller/helm-tiller-dp.tmpl

@@ -46,7 +46,7 @@ spec:
               value: kube-system
             - name: TILLER_HISTORY_MAX
               value: "0"
-          image: gcr.io/kubernetes-helm/tiller:v2.16.7
+          image: gcr.io/kubernetes-helm/tiller:v2.16.8
           imagePullPolicy: IfNotPresent
           livenessProbe:
             failureThreshold: 3