boot2docker: add cluster bootstrap and doc

hack/cluster-pod.yaml

@@ -1,36 +0,0 @@
-version: v1beta1
-id: cluster-pod
-containers:
-  - name: etcd
-    image: coreos/etcd
-  - name: kubelet
-    image: kubernetes-kubelet
-    imagePullPolicy: never
-    volumeMounts:
-      - name: docker-socket
-        mountPath: /var/run/docker.sock
-  - name: apiserver
-    image: kubernetes-apiserver
-    imagePullPolicy: never
-    ports:
-      - name: apiserver-port
-        hostPort: 8080
-        containerPort: 8080
-        protocol: TCP
-    env:
-      - name: KUBE_MINIONS
-        value: 127.0.0.1
-  - name: controller-manager
-    image: kubernetes-controller-manager
-    imagePullPolicy: never
-  - name: proxy
-    image: kubernetes-proxy
-    imagePullPolicy: never
-  - name: scheduler
-    image: kubernetes-scheduler
-    imagePullPolicy: never
-volumes:
-  - name: docker-socket
-    source:
-      hostDir:
-        path: /var/run/docker.sock