Move horizon config and start to appropriate phase in stack.sh

Previously horizon configuration and start are done too early
and as a result horizon init and start need to be run twice
after horizon plugins are enabled.
- horizon config was done before "run_phase stack install"
- horizon init and start were done before "run_phase stack post-config"

This commit rearrange horizon setup to the appropriate phases
defined in the devstack plugin interface.

- Configuration of horizon settings is moved to configure_horizon.
- horizon config is now called between run_phase stack install
  and post-config.
- horizon init and start are now called between run_phase stack
  post-config and extra.

Change-Id: I8bf2ceaf7734c4f7cec68bc05d7cdbae81ef311e

lib/horizon

@@ -83,10 +83,7 @@ function configure_horizon {
     # Message catalog compilation is handled by Django admin script,
     # so compiling them after the installation avoids Django installation twice.
     (cd $HORIZON_DIR; ./run_tests.sh -N --compilemessages)
-}
 
-# init_horizon() - Initialize databases, etc.
-function init_horizon {
     # ``local_settings.py`` is used to override horizon default settings.
     local local_settings=$HORIZON_DIR/openstack_dashboard/local/local_settings.py
     cp $HORIZON_SETTINGS $local_settings
@@ -113,6 +110,7 @@ function init_horizon {
     horizon_conf=$(apache_site_config_for horizon)
 
     # Configure apache to run horizon
+    # Set up the django horizon application to serve via apache/wsgi
     sudo sh -c "sed -e \"
         s,%USER%,$APACHE_USER,g;
         s,%GROUP%,$APACHE_GROUP,g;
@@ -133,7 +131,10 @@ function init_horizon {
         exit_distro_not_supported "horizon apache configuration"
     fi
     enable_apache_site horizon
+}
 
+# init_horizon() - Initialize databases, etc.
+function init_horizon {
     # Remove old log files that could mess with how DevStack detects whether Horizon
     # has been successfully started (see start_horizon() and functions::screen_it())
     # and run_process
@@ -147,6 +148,7 @@ function init_horizon {
         django_admin=django-admin.py
     fi
 
+    # These need to be run after horizon plugins are configured.
     DJANGO_SETTINGS_MODULE=openstack_dashboard.settings $django_admin collectstatic --noinput
     DJANGO_SETTINGS_MODULE=openstack_dashboard.settings $django_admin compress --force
 

stack.sh

@@ -840,7 +840,6 @@ if is_service_enabled horizon; then
     install_django_openstack_auth
     # dashboard
     stack_install_service horizon
-    configure_horizon
 fi
 
 if is_service_enabled heat; then
@@ -1060,12 +1059,9 @@ write_clouds_yaml
 # Horizon
 # -------
 
-# Set up the django horizon application to serve via apache/wsgi
-
 if is_service_enabled horizon; then
-    echo_summary "Configuring and starting Horizon"
+    echo_summary "Configuring Horizon"
-    init_horizon
+    configure_horizon
-    start_horizon
 fi
 
 
@@ -1290,6 +1286,12 @@ if is_service_enabled heat; then
     fi
 fi
 
+if is_service_enabled horizon; then
+    echo_summary "Starting Horizon"
+    init_horizon
+    start_horizon
+fi
+
 
 # Create account rc files
 # =======================