Revert "Upgrade kubectl embedded in protokube to 1.6.0"

This reverts commit 03b08530cb.

images/protokube-builder/onbuild.sh

@@ -34,5 +34,5 @@ cp /go/bin/channels /src/.build/artifacts/
 
 # channels uses protokube
 cd /src/.build/artifacts/
-curl -O https://storage.googleapis.com/kubernetes-release/release/v1.6.0-beta.1/bin/linux/amd64/kubectl
+curl -O https://storage.googleapis.com/kubernetes-release/release/v1.5.1/bin/linux/amd64/kubectl
 chmod +x kubectl

upup/models/cloudup/resources/addons/kube-dns.addons.k8s.io/v1.6.0.yaml.template

@@ -228,3 +228,11 @@ spec:
   - name: dns-tcp
     port: 53
     protocol: TCP
+
+---
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: kube-dns
+  namespace: kube-system