docs: def ib_group_member_list(self, group_id):
          ''' ib group member list '''
          req_hook = 'pod/v1/admin/group/' + group_id + '/membership/list'
          req_args = None
          status_code, response = self.__rest__.GET_query(req_hook, req_args)
          self.logger.debug('%s: %s' % (status_code, response))
          return status_code, response