[Android] Add a custom pylintrc for build/android/.

build/android/tombstones.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 #
 # Find the most recent tombstone file(s) on all connected devices
 # and prints their stacks.
 #
 # Assumes tombstone file was created with current symbols.
 
 import datetime
-import itertools
 import logging
 import multiprocessing
 import os
 import re
 import subprocess
 import sys
 import optparse
 
 from devil.android import device_blacklist
 from devil.android import device_errors
 from devil.android import device_utils
-from devil.android.sdk import adb_wrapper
 from devil.utils import run_tests_helper
 
 
 _TZ_UTC = {'TZ': 'UTC'}
 
 def _ListTombstones(device):
   """List the tombstone files on the device.
 
   Args:
     device: An instance of DeviceUtils.
@@ skipping 216 matching lines @@
   # http://bugs.python.org/issue7980
   tombstones = []
   for device in devices:
     tombstones += _GetTombstonesForDevice(device, options)
 
   _ResolveTombstones(options.jobs, tombstones)
 
 
 if __name__ == '__main__':
   sys.exit(main())