Remove unused notification method and class

The @notifications.internal decorator was recently removed in favor of inline
notifications. It was also the only method in keystone's notification framework
that used the notification.py:ManagerNotificationWrapper class, so that was
removed as well.

Change-Id: Ia5efbd9d9e3c1fad324dd7be84b2987048edb650

keystone/notifications.py

@@ -196,74 +196,6 @@ class Audit(object):
                   public)
 
 
-class ManagerNotificationWrapper(object):
-    """Send event notifications for ``Manager`` methods.
-
-    Sends a notification if the wrapped Manager method does not raise an
-    :class:`Exception` (such as :class:`keystone.exception.NotFound`).
-
-    :param operation: one of the values from ACTIONS
-    :param resource_type: type of resource being affected
-    :param public:  If True (default), the event will be sent to the notifier
-                    API.  If False, the event will only be sent via
-                    notify_event_callbacks to in process listeners
-
-    """
-
-    def __init__(self, operation, resource_type, public=True,
-                 resource_id_arg_index=1, result_id_arg_attr=None):
-        self.operation = operation
-        self.resource_type = resource_type
-        self.public = public
-        self.resource_id_arg_index = resource_id_arg_index
-        self.result_id_arg_attr = result_id_arg_attr
-
-    def __call__(self, f):
-        @functools.wraps(f)
-        def wrapper(*args, **kwargs):
-            """Send a notification if the wrapped callable is successful."""
-            try:
-                result = f(*args, **kwargs)
-            except Exception:
-                raise
-            else:
-                if self.result_id_arg_attr is not None:
-                    resource_id = result[self.result_id_arg_attr]
-                else:
-                    resource_id = args[self.resource_id_arg_index]
-
-                # NOTE(stevemar): the _send_notification function is
-                # overloaded, it's used to register callbacks and to actually
-                # send the notification externally. Thus, we should check
-                # the desired notification format in the function instead
-                # of before it.
-                _send_notification(
-                    self.operation,
-                    self.resource_type,
-                    resource_id,
-                    public=self.public)
-
-                # Only emit CADF notifications for public events
-                if CONF.notification_format == 'cadf' and self.public:
-                    outcome = taxonomy.OUTCOME_SUCCESS
-                    # NOTE(morganfainberg): The decorator form will always use
-                    # a 'None' initiator, since we do not pass context around
-                    # in a manner that allows the decorator to inspect context
-                    # and extract the needed information.
-                    initiator = None
-                    _create_cadf_payload(self.operation, self.resource_type,
-                                         resource_id, outcome, initiator)
-            return result
-
-        return wrapper
-
-
-def internal(*args, **kwargs):
-    """Decorator to send notifications for internal notifications only."""
-    kwargs['public'] = False
-    return ManagerNotificationWrapper(ACTIONS.internal, *args, **kwargs)
-
-
 def _get_callback_info(callback):
     """Return list containing callback's module and name.