Fix swift entries in group_vars/globals.yml

Change-Id: I41c2fb7d476d553aeaca34feef1d045967c284fb

ansible/group_vars/all.yml

@@ -833,7 +833,6 @@ panko_database_type: "mysql"
 # Gnocchi options
 #################
 # Valid options are [ file, ceph, swift ]
-# Defaults to file if ceph and swift are enabled; explicitly set to either if required.
 gnocchi_backend_storage: "{% if enable_swift | bool %}swift{% else %}file{% endif %}"
 
 # Valid options are [redis, '']

etc/kolla/globals.yml

@@ -446,8 +446,8 @@
 #################
 # Gnocchi options
 #################
-# Valid options are [ file, ceph ]
-#gnocchi_backend_storage: "file"
+# Valid options are [ file, ceph, swift ]
+#gnocchi_backend_storage: "{% if enable_swift | bool %}swift{% else %}file{% endif %}"
 
 # Valid options are [redis, '']
 #gnocchi_incoming_storage: "{{ 'redis' if enable_redis | bool else '' }}"