[Telemetry] Move discover to common/py_utils

telemetry/telemetry/testing/story_set_smoke_test.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 logging
 import os
 import unittest
 
-from telemetry.core import discover
 from telemetry.internal.browser import browser_credentials
 from telemetry.internal import story_runner
 from telemetry import page
 from telemetry import story as story_module
 from telemetry.wpr import archive_info
 
+from py_utils import discover
 
 class StorySetSmokeTest(unittest.TestCase):
 
   def setUp(self):
     # Make sure the added failure message is appended to the default failure
     # message.
     self.longMessage = True
 
   def GetAllStorySetClasses(self, story_sets_dir, top_level_dir):
     # We can't test page sets that aren't directly constructible since we
@@ skipping 120 matching lines @@
     method to run smoke test.
     """
     story_sets = self.GetAllStorySetClasses(story_sets_dir, top_level_dir)
     for story_set_class in story_sets:
       story_set = story_set_class()
       self.CheckArchive(story_set)
       self.CheckCredentials(story_set)
       self.CheckAttributes(story_set)
       self.CheckSharedStates(story_set)
       self.CheckPassingStoryRunnerValidation(story_set)