Create docker image for kubelet

cluster/images/kubelet/Dockerfile

+FROM centos
+ADD kubelet /kubelet
+RUN chmod a+rx /kubelet
+ADD nsenter /nsenter
+RUN chmod a+rx /nsenter
+
+VOLUME /var/lib/docker
+VOLUME /var/lib/kubelet
+CMD [ "/kubelet" ]

cluster/images/kubelet/Makefile

+# build the kubelet image.
+
+# TODO: figure out the best base image
+# TODO: figure out how to best source the nsenter binary, if necessary
+
+VERSION=v0.16
+
+release:
+	curl -O https://storage.googleapis.com/kubernetes-release/release/${VERSION}/bin/linux/amd64/kubelet
+	docker build -t gcr.io/google_containers/kubelet:${VERSION} .
+	gcloud preview docker push gcr.io/google_containers/kubelet:${VERSION}
+
+local:
+	docker build -t gcr.io/google_containers/kubelet:${VERSION} .
+
+.PHONY: release