Modify au_test_harness and ctest to work from new location.

au_test_harness/cros_au_test_harness.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This module runs a suite of Auto Update tests.
 
   The tests can be run on either a virtual machine or actual device depending
   on parameters given.  Specific tests can be run by invoking --test_prefix.
   Verbose is useful for many of the tests if you want to see individual commands
   being run during the update process.
 """
 
 import optparse
 import os
 import re
 import sys
 import unittest
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '../lib'))
+# TODO(sosa): Migrate to chromite cros_build_lib.
+import constants
+sys.path.append(constants.CROSUTILS_LIB_DIR)
 import cros_build_lib as cros_lib
 
 import au_test
 import au_worker
 import dummy_au_worker
 import dev_server_wrapper
 import parallel_test_job
 import public_key_manager
 import update_exception
 
@@ skipping 237 matching lines @@
     if options.public_key:
       cros_lib.Info('Cleaning up.  Removing keys added as part of testing.')
       target_directory = os.path.dirname(options.target_image)
       for key_manager in au_test.AUTest.public_key_managers:
         if key_manager.image_path.startswith(target_directory):
           key_manager.RemoveKeyFromImage()
 
 
 if __name__ == '__main__':
   main()