Create a new depot_tools_testing_lib to move utility modules there

testing_support/local_rietveld.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Setups a local Rietveld instance to test against a live server for
 integration tests.
 
 It makes sure Google AppEngine SDK is found, download Rietveld and Django code
 if necessary and starts the server on a free inbound TCP port.
 """
 
 import optparse
 import os
 import socket
 import sys
 import time
 
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 import subprocess2
 
 
 class Failure(Exception):
   pass
 
 
 def test_port(port):
   s = socket.socket()
   try:
@@ skipping 114 matching lines @@
     instance.start_server(verbose=options.verbose)
     print 'Local rietveld instance started on port %d' % instance.port
     while True:
       time.sleep(0.1)
   finally:
     instance.stop_server()
 
 
 if __name__ == '__main__':
   main()