Add devstack plugin bits

This commit adds a devstack directory
and the settings and plugin.sh files
that shold allow easy integration with
devstack. The README file is also updated
to indidcate how users can test the
app-catalog-ui Horizon plugin using
Devstack.

Change-Id: Ib7a79ce789de6882ff4ac2813ca62bab0f42c788

README.rst

@@ -15,6 +15,16 @@ apps-catalog-ui is intended to use only on systems running Horizon
 How to try this package
 =======================
 
+With Devstack
+-------------
+Add the following to your Devstack local.conf file
+
+::
+  enable_plugin app-catalog-ui https://git.openstack.org/stackforge/apps-catalog-ui
+
+With Horizon
+------------
+
 ::
 
   git clone http://github.com/openstack/horizon.git

devstack/plugin.sh

@@ -0,0 +1,48 @@
+# plugin.sh - DevStack plugin.sh dispatch script app-catalog-ui
+
+APP_CAT_UI_DIR=$(cd $(dirname $BASH_SOURCE)/.. && pwd)
+
+function install_app-catalog-ui {
+    sudo pip install --upgrade ${APP_CAT_UI_DIR}
+    cp -a ${APP_CAT_UI_DIR}/app_catalog/static ${DEST}/horizon/
+    cp -a ${APP_CAT_UI_DIR}/enabled/* ${DEST}/horizon/openstack_dashboard/enabled/
+    python ${DEST}/horizon/manage.py compress --force
+}
+
+# check for service enabled
+if is_service_enabled app-catalog-ui; then
+
+    if [[ "$1" == "stack" && "$2" == "pre-install" ]]; then
+        # Set up system services
+        # no-op
+        :
+
+    elif [[ "$1" == "stack" && "$2" == "install" ]]; then
+        # Perform installation of service source
+        # no-op
+        :
+
+    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+        # Configure after the other layer 1 and 2 services have been configured
+        echo_summary "Installing App Catalog UI"
+        install_app-catalog-ui
+
+    elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+        # Initialize and start the app-catalog-ui service
+        # no-op
+        :
+    fi
+
+    if [[ "$1" == "unstack" ]]; then
+        # Shut down app-catalog-ui services
+        # no-op
+        :
+    fi
+
+    if [[ "$1" == "clean" ]]; then
+        # Remove state and transient data
+        # Remember clean.sh first calls unstack.sh
+        # no-op
+        :
+    fi
+fi

devstack/settings

@@ -0,0 +1,2 @@
+# settings file for app-catalog-ui plugin
+enable_service app-catalog-ui