fix kube dns issue

src/ClusterBootstrap/template/kube-addons/dns-addon.yml

@@ -46,6 +46,7 @@ spec:
         scheduler.alpha.kubernetes.io/critical-pod: ''
         scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
     spec:
+      dnsPolicy: Default
       containers:
       - name: kubedns
         image: gcr.io/google_containers/kubedns-amd64:1.8
@@ -127,7 +128,6 @@ spec:
         ports:
         - containerPort: 8080
           protocol: TCP
-      dnsPolicy: ClusterFirstWithHostNet 
       volumes:
       - hostPath:
           path: /etc/kubernetes