Providing kubeconfig file is now the switch for standalone mode

Replaces use of --api-servers with --kubeconfig in Kubelet args across
the turnup scripts. In many cases this involves generating a kubeconfig
file for the Kubelet and placing it in the correct location on the node.

cluster/libvirt-coreos/user_data_minion.yml

@@ -17,7 +17,7 @@ coreos:
         --address=0.0.0.0 \
         --hostname-override=${NODE_IPS[$i]} \
         --cluster-domain=cluster.local \
-        --api-servers=http://${MASTER_IP}:8080 \
+        --kubeconfig=/opt/kubernetes/kubeconfig/kubelet.kubeconfig \
         --tls-cert-file=/opt/kubernetes/certs/${NODE_NAMES[$i]}-node.pem \ \
         --tls-private-key-file=/opt/kubernetes/certs/${NODE_NAMES[$i]}-node-key.pem \
         $( [[ "$ENABLE_CLUSTER_DNS" == "true" ]] && echo "--cluster-dns=${DNS_SERVER_IP}" ) \

cluster/libvirt-coreos/util.sh

@@ -33,6 +33,38 @@ readonly POOL_PATH=/var/lib/libvirt/images/kubernetes
 
 [ ! -d "${POOL_PATH}" ] && (echo "$POOL_PATH" does not exist ; exit 1 )
 
+# Creates a kubeconfig file for the kubelet.
+# Args: address (e.g. "http://localhost:8080"), destination file path
+function create-kubelet-kubeconfig() {
+  local apiserver_address="${1}"
+  local destination="${2}"
+  if [[ -z "${apiserver_address}" ]]; then
+    echo "Must provide API server address to create Kubelet kubeconfig file!"
+    exit 1
+  fi
+  if [[ -z "${destination}" ]]; then
+    echo "Must provide destination path to create Kubelet kubeconfig file!"
+    exit 1
+  fi
+  echo "Creating Kubelet kubeconfig file"
+  local dest_dir="$(dirname "${destination}")"
+  mkdir -p "${dest_dir}" &>/dev/null || sudo mkdir -p "${dest_dir}"
+  sudo=$(test -w "${dest_dir}" || echo "sudo -E")
+  cat <<EOF | ${sudo} tee "${destination}" > /dev/null
+apiVersion: v1
+kind: Config
+clusters:
+  - cluster:
+      server: ${apiserver_address}
+    name: local
+contexts:
+  - context:
+      cluster: local
+    name: local
+current-context: local
+EOF
+}
+
 # join <delim> <list...>
 # Concatenates the list elements with the delimiter passed as first parameter
 #
@@ -279,6 +311,7 @@ function kube-up {
   export KUBE_SERVER="http://192.168.10.1:8080"
   export CONTEXT="libvirt-coreos"
   create-kubeconfig
+  create-kubelet-kubeconfig "http://${MASTER_IP}:8080" "${POOL_PATH}/kubernetes/kubeconfig/kubelet.kubeconfig"
 
   wait-cluster-readiness