docs: def _get_caller(self, conf):
          '''
          Get & setup caller from the factory.
  
          :param conf:
          :return:
          '''
          conf = self._setup_fun_config(copy.deepcopy(conf))
          if not getattr(self, '_caller', None):
              self._caller = salt.cli.caller.Caller.factory(conf)
          else:
              self._caller.opts = conf
          return self._caller