fix coreos dns policy in cluster service mode (#1651)

* fix coreos dns policy in cluster service mode

* Bump chart version

stable/coredns/Chart.yaml

@@ -1,5 +1,5 @@
 name: coredns
-version: 0.2.0
+version: 0.3.0
 description: CoreDNS is a DNS server that chains middleware and provides Kubernetes DNS Services
 keywords:
 - coredns

stable/coredns/templates/deployment.yaml

@@ -37,6 +37,9 @@ spec:
         scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
         {{- end }}
     spec:
+      {{- if .Values.isClusterService }}
+      dnsPolicy: Default
+      {{- end }}
       containers:
       - name: "coredns"
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"