Update the mDNS command line tools in the mdns package

pkg/mdns/lib/mdns.dart

 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 library mdns;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:io';
 import 'dart:typed_data';
@@ skipping 40 matching lines @@
   ///
   /// The [name] must be the fully qualified name (that is including
   /// the domain '.local'); for example `printer.local`.
   ///
   /// The stream is closed after the timeout is reached.
   Stream<ResourceRecord> lookup(
       int type,
       String name,
       {Duration timeout: const Duration(seconds: 5)});
 }
-
-// Simple standalone test.
-Future main(List<String> args) async {
-  var client = new MDnsClient();
-  await client.start();
-  ResourceRecord resource = await client.lookup(RRType.A, args[0]).first;
-  print(address);
-  client.stop();
-}