Rackspace - Switch to CoreOS for standard cluster

The Rackspace setup for Kubernetes now leverages CoreOS instead of Ubuntu. We've dropped Salt completely for our cluster.

cluster/rackspace/kube-up.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Bring up a Kubernetes cluster.
+#
+# If the full release name (gs://<bucket>/<release>) is passed in then we take
+# that directly.  If not then we assume we are doing development stuff and take
+# the defaults in the release config.
+
+# exit on any error
+set -e
+
+source $(dirname $0)/../kube-env.sh
+source $(dirname $0)/../$KUBERNETES_PROVIDER/util.sh
+
+echo "Starting cluster using provider: $KUBERNETES_PROVIDER"
+
+verify-prereqs
+kube-up
+
+# skipping validation for now until since machines show up as private IPs
+# source $(dirname $0)/validate-cluster.sh
+
+echo "Done"