Removes all labels for a given client.

    Args:
      client_id: The client_id.

def RemoveAllClientLabels(self, client_id):
    """Removes all labels for a given client.

    Args:
      client_id: The client_id.
    """
    labels_to_remove = set(
        [l.name for l in data_store.REL_DB.ReadClientLabels(client_id)])
    self.RemoveClientLabels(client_id, labels_to_remove)