au_test_harness: fix a function call, add sudo in front of ifconfig

bin/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.
@@ skipping 464 matching lines @@
   def ProcessOptions(cls, parser, options):
     """Processes non-vm-specific options."""
     AUTest.ProcessOptions(parser, options)
     cls.remote = options.remote
 
     if not cls.remote:
       parser.error('We require a remote address for real tests.')
 
   def PrepareBase(self, image_path):
     """Auto-update to base image to prepare for test."""
-    _PrepareRealBase(image_path)
+    self._PrepareRealBase(image_path)
 
   def _UpdateImage(self, image_path, src_image_path='', stateful_change='old',
                    proxy_port=None, private_key_path=None):
     """Updates a remote image using image_to_live.sh."""
     stateful_change_flag = self.GetStatefulChangeFlag(stateful_change)
     cmd = ['%s/image_to_live.sh' % self.crosutils,
            '--remote=%s' % self.remote,
            stateful_change_flag,
            '--verify',
           ]
@@ skipping 574 matching lines @@
       # Can't run in parallel with only one remote device.
       test_suite = _PrepareTestSuite(parser, options, test_class)
       test_result = unittest.TextTestRunner(verbosity=2).run(test_suite)
       if not test_result.wasSuccessful(): Die('Test harness failed.')
   finally:
     my_server.Stop()
 
 
 if __name__ == '__main__':
   main()