[Android] Move some pylib modules into devil/

build/android/pylib/device/device_list.py

-# Copyright 2014 The Chromium Authors. All rights reserved.
+# Copyright 2015 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.
 
-"""A module to keep track of devices across builds."""
+# pylint: disable=unused-wildcard-import
+# pylint: disable=wildcard-import
 
-import os
-
-LAST_DEVICES_FILENAME = '.last_devices'
-LAST_MISSING_DEVICES_FILENAME = '.last_missing'
-
-
-def GetPersistentDeviceList(file_name):
-  """Returns a list of devices.
-
-  Args:
-    file_name: the file name containing a list of devices.
-
-  Returns: List of device serial numbers that were on the bot.
-  """
-  with open(file_name) as f:
-    return f.read().splitlines()
-
-
-def WritePersistentDeviceList(file_name, device_list):
-  path = os.path.dirname(file_name)
-  if not os.path.exists(path):
-    os.makedirs(path)
-  with open(file_name, 'w') as f:
-    f.write('\n'.join(set(device_list)))
+from devil.android.device_list import *