[Findit] Re-org code.

appengine/findit/waterfall/test/send_notification_for_culprit_pipeline_test.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.
 
 import datetime
 
-from common.rietveld import Rietveld
+from infra_api_clients.codereview.rietveld import Rietveld
 from lib.gitiles.gitiles_repository import GitilesRepository
 from model import analysis_status as status
 from model.wf_culprit import WfCulprit
 from waterfall import build_util
 from waterfall import send_notification_for_culprit_pipeline
 from waterfall.send_notification_for_culprit_pipeline import (
     SendNotificationForCulpritPipeline)
 from waterfall.test import wf_testcase
 
 
@@ skipping 112 matching lines @@
     self._MockGitRepository('url')
     self.MockUTCNow(_MOCKED_DATETIME_UTCNOW)
     self._MockBuildEndTime()
     culprit = WfCulprit.Create('chromium', 'r7', 123)
     culprit.builds.append(['m', 'b71', 71])
     culprit.put()
 
     pipeline = SendNotificationForCulpritPipeline()
     self.assertFalse(pipeline.run('m', 'b71', 71, 'chromium', 'r7', False))
     self.assertEqual(0, len(rietveld_requests))