Give the API server access to TLS certs.

Moved the cert generation to a separate salt state and put it in a more appropriate sharable location (`/srv/kubernetes/`).

cluster/saltbase/salt/generate-cert/make-cert.sh

@@ -0,0 +1,21 @@
+#!/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.
+
+cert_dir=/srv/kubernetes
+
+openssl req -new -newkey rsa:4096 -days 365 -nodes -x509 \
+  -subj "/CN=kubernetes.invalid/O=Kubernetes" \
+  -keyout "${cert_dir}/server.key" -out "${cert_dir}/server.cert"