Salt: support systemd (don't assume Redhat <=> systemd)

Also work around problems with Salt & systemd services, in particular
that Salt doesn't issue a daemon-reload.

cluster/saltbase/salt/salt-helpers/init.sls

@@ -0,0 +1,15 @@
+{% if pillar.get('is_systemd') %}
+/opt/kubernetes/helpers:
+  file.directory:
+    - user: root
+    - group: root
+    - makedirs: True
+    - dir_mode: 755
+
+/opt/kubernetes/helpers/services:
+  file.managed:
+    - source: salt://salt-helpers/services
+    - user: root
+    - group: root
+    - mode: 755
+{% endif %}

cluster/saltbase/salt/salt-helpers/services

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# Copyright 2015 The Kubernetes Authors 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.
+
+set -e
+
+ACTION=${1}
+SERVICE=${2}
+
+if [[ -z "${ACTION}" || -z "${SERVICE}" ]]; then
+  echo "Syntax: ${0} <action> <service>"
+  exit 1
+fi
+
+
+function reload_state() {
+  systemctl daemon-reload
+}
+
+function start_service() {
+  systemctl start ${SERVICE}
+}
+
+function stop_service() {
+  systemctl stop ${SERVICE}
+}
+
+function enable_service() {
+  systemctl enable ${SERVICE}
+}
+
+function disable_service() {
+  systemctl disable ${SERVICE}
+}
+
+function restart_service() {
+  systemctl restart ${SERVICE}
+}
+
+if [[ "${ACTION}" == "up" ]]; then
+  reload_state
+  enable_service
+  start_service
+elif [[ "${ACTION}" == "bounce" ]]; then
+  reload_state
+  enable_service
+  restart_service
+elif [[ "${ACTION}" == "down" ]]; then
+  reload_state
+  disable_service
+  stop_service
+else
+  echo "Unknown action: ${ACTION}"
+  exit 1
+fi