Remove -v /dev:/dev from docker and docker-multinode

docs/getting-started-guides/docker-multinode/master.sh

@@ -207,7 +207,6 @@ start_k8s(){
         -v /sys:/sys:ro \
         -v /var/run:/var/run:rw \
         -v /:/rootfs:ro \
-        -v /dev:/dev \
         -v /var/lib/docker/:/var/lib/docker:rw \
         -v /var/lib/kubelet/:/var/lib/kubelet:rw \
         gcr.io/google_containers/hyperkube-${ARCH}:v${K8S_VERSION} \