Merge "Update horizon wsgi wrapper to the recommended one"

Author: Zuul

files/apache-horizon.template

@@ -1,5 +1,5 @@
 <VirtualHost *:80>
-    WSGIScriptAlias %WEBROOT% %HORIZON_DIR%/openstack_dashboard/wsgi/django.wsgi
+    WSGIScriptAlias %WEBROOT% %HORIZON_DIR%/openstack_dashboard/wsgi.py
     WSGIDaemonProcess horizon user=%USER% group=%GROUP% processes=3 threads=10 home=%HORIZON_DIR% display-name=%{GROUP}
     WSGIApplicationGroup %{GLOBAL}