make version of ts_mon compatible with appengine

infra_libs/ts_mon/test/interface_test.py

 # 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.
 
 import functools
 import threading
 import time
 import unittest
 
 import mock
 
 from testing_support import auto_stub
 
-from infra_libs.ts_mon import errors
 from infra_libs.ts_mon import interface
+from infra_libs.ts_mon.common import errors
 from infra_libs.ts_mon.test import stubs
 
 
 class GlobalsTest(auto_stub.TestCase):
 
   def setUp(self):
     super(GlobalsTest, self).setUp()
     self.mock(interface, 'state', stubs.MockState())
 
   def tearDown(self):
@@ skipping 256 matching lines @@
 
   def test_sleeps_for_minimum_zero_secs(self):
     self.t.start()
 
     # Flush takes 65 seconds.
     interface.flush.side_effect = functools.partial(self.increment_time, 65)
 
     self.assertInRange(30, 60, self.stop_event.timeout_wait())
     self.assertAlmostEqual(0, self.stop_event.timeout_wait())
     self.assertAlmostEqual(0, self.stop_event.timeout_wait())