Migrate first block of tests in standalone to standalone_2

tests/standalone_2/http_launch_data/http_spawn_main.dart

 // Copyright (c) 2013, the Dart 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 file.
 
 library http_launch_main;
 
 import 'dart:isolate';
 import 'dart:io';
 
 main(List<String> arguments) {
   int port = int.parse(arguments[0]);
   ReceivePort receivePort = new ReceivePort();
   Isolate.spawnUri(Uri.parse('http://127.0.0.1:$port/http_isolate_main.dart'),
       ['hello'], receivePort.sendPort);
   receivePort.first.then((response) {
     print(response);
   });
 }