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

tools/telemetry/telemetry/internal/backends/android_command_line_backend_unittest.py

 # 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.
 
 import logging
 import unittest
 
 from telemetry import decorators
 from telemetry.internal.backends import android_command_line_backend
 from telemetry.testing import options_for_unittests
 
-from pylib.device import device_utils
+from devil.android import device_utils
 
 
 class _MockBackendSettings(object):
   pseudo_exec_name = 'chrome'
 
   def __init__(self, path):
     self._path = path
 
   def GetCommandLineFile(self, _):
     return self._path
@@ skipping 71 matching lines @@
       return
     cmd_file = '/data/local/tmp/test_cmd'
     backend_settings = _MockBackendSettings(cmd_file)
     startup_args = ['--some', '--test', '--args']
     device.RunShellCommand(['rm', '-f', cmd_file], check_return=True)
     with android_command_line_backend.SetUpCommandLineFlags(
         device, backend_settings, startup_args):
       self.assertEqual('chrome --some --test --args',
                        device.ReadFile(cmd_file).strip())
     self.assertFalse(device.FileExists(cmd_file))