luci-py: Making __file__ usage unicode safe.

client/libs/logdog/tests/bootstrap_test.py

 #!/usr/bin/env python
 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import os
 import sys
 import unittest
 
 ROOT_DIR = os.path.dirname(os.path.abspath(os.path.join(
-    __file__, os.pardir, os.pardir, os.pardir)))
+    __file__.decode(sys.getfilesystemencoding()),
+    os.pardir, os.pardir, os.pardir)))
 sys.path.insert(0, ROOT_DIR)
 
 from libs.logdog import bootstrap
 
 
 class BootstrapTestCase(unittest.TestCase):
 
   def setUp(self):
     self.env = {
         bootstrap.ButlerBootstrap._ENV_PROJECT: 'test-project',
@@ skipping 23 matching lines @@
         bootstrap.ButlerBootstrap.probe, env=self.env)
 
   def testProbeInvalidPrefixRaisesError(self):
     self.env[bootstrap.ButlerBootstrap._ENV_PREFIX] = '!!! not valid !!!'
     self.assertRaises(bootstrap.NotBootstrappedError,
         bootstrap.ButlerBootstrap.probe, env=self.env)
 
 
 if __name__ == '__main__':
   unittest.main()