docs: def _internal_function_call(self, call_conf):
          '''
          Call internal function.
  
          :param call_conf:
          :return:
          '''
          def stub(*args, **kwargs):
              message = 'Function {} is not available'.format(call_conf['fun'])
              self.out.error(message)
              log.debug(
                  'Attempt to run "%s" with %s arguments and %s parameters.',
                  call_conf['fun'], call_conf['arg'], call_conf['kwargs']
              )
              return message
  
          return getattr(salt.cli.support.intfunc,
                         call_conf['fun'], stub)(self.collector,
                                                 *call_conf['arg'],
                                                 **call_conf['kwargs'])