luci-py: Making __file__ usage unicode safe.

client/libs/logdog/tests/stream_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 json
 import os
 import sys
 import unittest
 import StringIO
 
 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 stream, varint
 
 
 class StreamParamsTestCase(unittest.TestCase):
 
   def setUp(self):
     self.params = stream.StreamParams(
         'name',
@@ skipping 170 matching lines @@
     conn = client.last_conn
     self.assertTrue(conn.closed)
 
     header, data = conn.interpret()
     self.assertEqual(header, {'name': 'mystream', 'type': 'text'})
     self.assertEqual(data, 'Using a text stream.')
 
 
 if __name__ == '__main__':
   unittest.main()