code: func (n *Network) NetworkGroupRunner() ifrit.Runner {
  	members := grouper.Members{
  		{Name: "brokers", Runner: n.BrokerGroupRunner()},
  		{Name: "orderers", Runner: n.OrdererGroupRunner()},
  		{Name: "peers", Runner: n.PeerGroupRunner()},
  	}
  	return grouper.NewOrdered(syscall.SIGTERM, members)
  }
docs: // NetworkGroupRunner returns a runner that can be used to start and stop an
  // entire fabric network.