[Android][telemetry] Update pylib imports for modules that moved into devil.

build/android/avd.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 """Launches Android Virtual Devices with a set configuration for testing Chrome.
 
 The script will launch a specified number of Android Virtual Devices (AVD's).
 """
 
 
 import install_emulator_deps
 import logging
 import optparse
 import os
 import re
 import sys
 
-from pylib import cmd_helper
+from devil.utils import cmd_helper
 from pylib import constants
 from pylib.utils import emulator
 
 
 def main(argv):
   # ANDROID_SDK_ROOT needs to be set to the location of the SDK used to launch
   # the emulator to find the system images upon launch.
   emulator_sdk = os.path.join(constants.EMULATOR_SDK_ROOT, 'sdk')
   os.environ['ANDROID_SDK_ROOT'] = emulator_sdk
 
@@ skipping 57 matching lines @@
   if options.name:
     emulator.LaunchEmulator(options.name, options.abi)
   else:
     emulator.LaunchTempEmulators(options.emulator_count, options.abi,
                                  options.api_level, True)
 
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))