Disabled flaky depot_tools tests

tests/checkout_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Unit tests for checkout.py."""
 
 import logging
 import os
 import shutil
@@ skipping 436 matching lines @@
       remote_branch='master',
       git_url=os.path.join(self.FAKE_REPOS.git_root,
                            self.FAKE_REPOS.TEST_GIT_REPO),
       commit_user=self.usr,
       post_processors=post_processors)
 
   def testAll(self):
     root = os.path.join(self.root_dir, self.name)
     self._check_base(self._get_co(None), root, None)
 
+  @unittest.skip('flaky')
   def testException(self):
     self._check_exception(
         self._get_co(None),
         'While running git apply --index -3 -p1;\n  fatal: corrupt patch at '
         'line 12\n')
 
   def testProcess(self):
     self._test_process(self._get_co)
 
   def _testPrepare(self):
@@ skipping 266 matching lines @@
   if '-v' in sys.argv:
     DEBUGGING = True
     logging.basicConfig(
         level=logging.DEBUG,
         format='%(levelname)5s %(filename)15s(%(lineno)3d): %(message)s')
   else:
     logging.basicConfig(
         level=logging.ERROR,
         format='%(levelname)5s %(filename)15s(%(lineno)3d): %(message)s')
   unittest.main()