Update the mDNS command line tools in the mdns package

pkg/mdns/bin/mdns-resolve.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.
+
+// Example script to illustrate how to use the mdns package to lookup names
+// on the local network.
+
+import 'package:args/args.dart';
+
+import '../lib/mdns.dart';
+
+main(List<String> args) async {
+  // Parse the command line arguments.
+  var parser = new ArgParser();
+  parser.addOption('timeout', abbr: 't', defaultsTo: '5');
+  var arguments = parser.parse(args);
+
+  if (arguments.rest.length != 1) {
+    print('''
+Please provide an address as argument.
+
+For example:
+  dart mdns-resolve.dart [--timeout <timeout>] fletch.local''');
+    return;
+  }
+
+  var name = arguments.rest[0];
+
+  MDnsClient client = new MDnsClient();
+  await client.start();
+  var timeout;
+  timeout = new Duration(seconds: int.parse(arguments['timeout']));
+  await for (ResourceRecord record in
+             client.lookup(RRType.A, name, timeout: timeout)) {
+    print('Found address (${record.address}).');
+  }
+  client.stop();
+}