Add new script to stop a kvm using vm library and use in harness.

bin/cros_au_test_harness.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 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.
 
 import optparse
 import os
 import re
 import sys
@@ skipping 428 matching lines @@
 
 
 class VirtualAUTest(unittest.TestCase, AUTest):
   """Test harness for updating virtual machines."""
   vm_image_path = None
 
   def _KillExistingVM(self, pid_file):
     if os.path.exists(pid_file):
       Warning('Existing %s found.  Deleting and killing process' %
               pid_file)
-      pid = RunCommand(['sudo', 'cat', pid_file], redirect_stdout=True,
-                       enter_chroot=False)
-      if pid:
-        RunCommand(['sudo', 'kill', pid.strip()], error_ok=True,
-                   enter_chroot=False)
-        RunCommand(['sudo', 'rm', pid_file], enter_chroot=False)
+      RunCommand(['./cros_stop_vm', '--kvm_pid=%s' % pid_file],
+                 cwd=self.crosutilsbin)
+
+    assert not os.path.exists(pid_file)
 
   def setUp(self):
     """Unit test overriden method.  Is called before every test."""
     AUTest.setUp(self)
     self._KillExistingVM(_KVM_PID_FILE)
 
   def PrepareBase(self, image_path):
     """Creates an update-able VM based on base image."""
     self.vm_image_path = '%s/chromiumos_qemu_image.bin' % os.path.dirname(
         image_path)
@@ skipping 164 matching lines @@
   elif options.type == 'real': test_class = RealAUTest
   else: parser.error('Could not parse harness type %s.' % options.type)
 
   remote = options.remote
 
   test_suite = test_loader.loadTestsFromTestCase(test_class)
   test_result = unittest.TextTestRunner(verbosity=2).run(test_suite)
 
   if not test_result.wasSuccessful():
     Die('Test harness was not successful')