tripleo_all_nodes_data: sort enabled_services (idempotency)

Sorting the enabled_services list so we can have idempotent hieradata
where the content doesn't change between Ansible runs of the
tripleo_all_nodes_data action plugin.

Change-Id: I8f54265dbadf21da6badd690f5cb123b549cf48c

tripleo_ansible/ansible_plugins/action/tripleo_all_nodes_data.py

@@ -170,8 +170,9 @@ class ActionModule(ActionBase):
 
         enabled_services += self.all_nodes_extra_map_data.get(
             'enabled_services', [])
-        # make enabled_services unique
+        # make enabled_services unique and sorted
         enabled_services = list(set(enabled_services))
+        enabled_services.sort()
 
         all_nodes['enabled_services'] = enabled_services