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

tools/telemetry/telemetry/internal/platform/android_device_unittest.py

 # Copyright 2014 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 unittest
 
 from telemetry.internal.browser import browser_options
 from telemetry.internal.platform import android_device
 from telemetry.testing import system_stub
 import mock
 
-from pylib.device import device_utils
+from devil.android import device_utils
 
 
 class _BaseAndroidDeviceTest(unittest.TestCase):
   def setUp(self):
     self._healthy_device_patcher = mock.patch(
-        'pylib.device.device_utils.DeviceUtils.HealthyDevices')
+        'devil.android.device_utils.DeviceUtils.HealthyDevices')
     self._healthy_device_mock = self._healthy_device_patcher.start()
     self._android_device_stub = system_stub.Override(
         android_device, ['subprocess', 'logging'])
 
   def _GetMockDeviceUtils(self, device_serial, is_online=True):
     device = device_utils.DeviceUtils(device_serial)
     device.IsOnline = mock.MagicMock(return_value=is_online)
     return device
 
   def tearDown(self):
@@ skipping 92 matching lines @@
           self._GetMockDeviceUtils('this0should0not0show', is_online=False),
           self._GetMockDeviceUtils('015d14fec128220d'),
           self._GetMockDeviceUtils('015d14fec128220e')]
       devices = android_device.FindAllAvailableDevices(finder_options)
       self.assertEquals([], self._android_device_stub.logging.warnings)
       self.assertIsNotNone(devices)
       self.assertEquals(len(devices), 3)
       self.assertEquals(devices[0].guid, '015d14fec128220c')
       self.assertEquals(devices[1].guid, '015d14fec128220d')
       self.assertEquals(devices[2].guid, '015d14fec128220e')