docs: def cmd_subset(
              self,
              tgt,
              fun,
              arg=(),
              tgt_type='glob',
              ret='',
              kwarg=None,
              sub=3,
              cli=False,
              progress=False,
              full_return=False,
              **kwargs):
          '''
          Execute a command on a random subset of the targeted systems
  
          The function signature is the same as :py:meth:`cmd` with the
          following exceptions.
  
          :param sub: The number of systems to execute on
          :param cli: When this is set to True, a generator is returned,
                      otherwise a dictionary of the minion returns is returned
  
          .. code-block:: python
  
              >>> SLC.cmd_subset('*', 'test.ping', sub=1)
              {'jerry': True}
          '''
          minion_ret = self.cmd(tgt,
                                'sys.list_functions',
                                tgt_type=tgt_type,
                                **kwargs)
          minions = list(minion_ret)
          random.shuffle(minions)
          f_tgt = []
          for minion in minions:
              if fun in minion_ret[minion]:
                  f_tgt.append(minion)
              if len(f_tgt) >= sub:
                  break
          func = self.cmd
          if cli:
              func = self.cmd_cli
          return func(
                  f_tgt,
                  fun,
                  arg,
                  tgt_type='list',
                  ret=ret,
                  kwarg=kwarg,
                  progress=progress,
                  full_return=full_return,
                  **kwargs)