Create a new depot_tools_testing_lib to move utility modules there

testing_support/fake_repos.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.
 
 """Generate fake repositories for testing."""
 
 import atexit
 import datetime
 import errno
 import logging
 import os
 import pprint
 import re
 import socket
 import sys
 import tempfile
 import time
 
 # trial_dir must be first for non-system libraries.
-from tests import trial_dir
+from testing_support import trial_dir
 import gclient_utils
 import scm
 import subprocess2
 
 
 def write(path, content):
   f = open(path, 'wb')
   f.write(content)
   f.close()
 
@@ skipping 711 matching lines @@
     fake.set_up_git()
     print('Fake setup, press enter to quit or Ctrl-C to keep the checkouts.')
     sys.stdin.readline()
   except KeyboardInterrupt:
     trial_dir.TrialDir.SHOULD_LEAK.leak = True
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))