'Delete all tokens for a list of user_ids.
:param user_ids: list of user identifiers
:param project_id: optional project identifier'

def delete_tokens_for_users(self, user_ids, project_id=None):

    if (not CONF.token.revoke_by_id):
        return
    for user_id in user_ids:
        self.delete_tokens_for_user(user_id, project_id=project_id)
