Add legacy init script for Ubuntu

For users who are using Ubuntu 14.04, systemd is not supported.
This patch add the sample init script for Ubuntu 14.04.

Change-Id: Icf2a1a85cd0c8eccb291dd05f43c0d6150665df3

contrib/legacy-ubuntu-init/README.rst

@@ -0,0 +1,41 @@
+===================================
+Legacy Init Script for Ubuntu 14.04
+===================================
+
+#. Clone the Zun repository:
+
+   .. code-block:: console
+
+      $ git clone https://git.openstack.org/openstack/zun.git
+
+#. Enable and start zun-api:
+
+   .. code-block:: console
+
+      # cp zun/contrib/legacy-ubuntu-init/etc/init/zun-api.conf \
+        /etc/init/zun-api.conf
+      # start zun-api
+
+#. Enable and start zun-wsproxy:
+
+   .. code-block:: console
+
+      # cp zun/contrib/legacy-ubuntu-init/etc/init/zun-wsproxy.conf \
+        /etc/init/zun-wsproxy.conf
+      # start zun-wsproxy
+
+#. Enable and start zun-compute:
+
+   .. code-block:: console
+
+      # cp zun/contrib/legacy-ubuntu-init/etc/init/zun-compute.conf \
+        /etc/init/zun-compute.conf
+      # start zun-compute
+
+#. Verify that zun services are running:
+
+   .. code-block:: console
+
+      # status zun-api
+      # status zun-wsproxy
+      # status zun-compute

contrib/legacy-ubuntu-init/etc/init/zun-api.conf

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+description "OpenStack Container Service API"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+
+exec start-stop-daemon --start --chuid zun \
+--chdir /var/lib/zun \
+--name zun-api \
+--exec /usr/local/bin/zun-api -- \
+--config-file=/etc/zun/zun.conf

contrib/legacy-ubuntu-init/etc/init/zun-compute.conf

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+description "OpenStack Container Service Compute Agent"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+
+exec start-stop-daemon --start --chuid zun \
+--chdir /var/lib/zun \
+--name zun-compute \
+--exec /usr/local/bin/zun-compute -- \
+--config-file=/etc/zun/zun.conf

contrib/legacy-ubuntu-init/etc/init/zun-wsproxy.conf

@@ -0,0 +1,12 @@
+description "OpenStack Container Service Websocket Proxy"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+
+exec start-stop-daemon --start --chuid zun \
+--chdir /var/lib/zun \
+--name zun-wsproxy \
+--exec /usr/local/bin/zun-wsproxy -- \
+--config-file=/etc/zun/zun.conf