[Telemetry] Move discover to common/py_utils

telemetry/telemetry/testing/run_browser_tests.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 fnmatch
 import re
 import sys
 import json
 
-from telemetry.core import discover
 from telemetry.internal.browser import browser_options
 from telemetry.internal.platform import android_device
 from telemetry.internal.util import binary_manager
 from telemetry.testing import browser_test_context
 from telemetry.testing import serially_executed_browser_test_case
 
+from py_utils import discover
 import typ
 from typ import arg_parser
 
 TEST_SUFFIXES = ['*_test.py', '*_tests.py', '*_unittest.py', '*_unittests.py']
 
 
 def ProcessCommandLineOptions(test_class, typ_options, args):
   options = browser_options.BrowserFinderOptions()
   options.browser_type = 'any'
   parser = options.CreateParser(test_class.__doc__)
@@ skipping 319 matching lines @@
 
 def _TearDownProcess(child, context):
   del child, context  # Unused.
   browser_test_context._global_test_context.test_class.TearDownProcess()
   browser_test_context._global_test_context = None
 
 
 if __name__ == '__main__':
   ret_code = RunTests(sys.argv[1:])
   sys.exit(ret_code)