Remove the ganeti Django app completely

Remove any reference to the synnefo.ganeti Django app
from the Django project, update README.upgrade accordingly.

README.upgrade

@@ -4,6 +4,12 @@ README.Upgrade
 This file documents the upgrade to newer versions of the Synnefo software.
 
 v0.5.3 -> v0.5.4
+REPOSITORY
+
+REMOVED APPS
+    * The ganeti/ app has been removed from the Django project completely.
+      Any explicit references to it in Django settings must be removed.
+
 REMOVED SETTINGS
     * 15-queues.conf: fix_amqp_settings (no need to call it anywhere)
 

settings.d/00-apps.conf

@@ -14,7 +14,6 @@ INSTALLED_APPS = (
     'synnefo.api',
     'synnefo.ui',
     'synnefo.db',
-    'synnefo.ganeti',
     'synnefo.logic',
     'synnefo.invitations',
     'synnefo.helpdesk',