Merge pull request #642 from kubernetes-incubator/k8s_imgpull

inventory/group_vars/all.yml

roles/dnsmasq/templates/dnsmasq-ds.yml

...es-apps/ansible/templates/calico-policy-controller.yml.j2

roles/kubernetes-apps/ansible/templates/kubedns-rc.yml

...tes/master/templates/manifests/kube-apiserver.manifest.j2

...r/templates/manifests/kube-controller-manager.manifest.j2

...tes/master/templates/manifests/kube-scheduler.manifest.j2

...ubernetes/node/templates/manifests/kube-proxy.manifest.j2

...bernetes/node/templates/manifests/nginx-proxy.manifest.j2

roles/network_plugin/canal/templates/canal-node.yml.j2

roles/network_plugin/flannel/templates/flannel-pod.yml