code: func (n *Network) OrdererAddress(o *Orderer, portName PortName) string {
  	return fmt.Sprintf("127.0.0.1:%d", n.OrdererPort(o, portName))
  }
docs: // OrdererAddress returns the address (host and port) exposed by the Orderer
  // for the named port. Command line tools should use the returned address when
  // connecting to the orderer.
  //
  // This assumes that the orderer is listening on 0.0.0.0 or 127.0.0.1 and is
  // available on the loopback address.