[Predator] Move testcase.py from libs/ to gae_libs/

appengine/findit/waterfall/test/wf_testcase.py

 # Copyright 2016 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.
 
 from google.appengine.api import users
 
 import copy
 
 import gae_ts_mon
 
-from libs.testcase import TestCase
+from gae_libs.testcase import TestCase
 from model.wf_config import FinditConfig
 
 
 _DEFAULT_STEPS_FOR_MASTERS_RULES = {
     'supported_masters': {
         'm': {
             'check_global': True,
         },
         'm3': {
             'check_global': True,
@@ skipping 126 matching lines @@
       config_data[config_property].update(override_data)
 
     FinditConfig.Get().Update(users.User(email='admin@chromium.org'), True,
                               **config_data)
 
   def setUp(self):
     super(WaterfallTestCase, self).setUp()
     self.UpdateUnitTestConfigSettings()
     self.maxDiff = None
     gae_ts_mon.reset_for_unittest(disable=True)