luci-py: Making __file__ usage unicode safe.

client/tests/zip_package_test.py

 #!/usr/bin/env python
 # Copyright 2013 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 cStringIO as StringIO
 import logging
 import os
 import subprocess
 import sys
 import tempfile
 import unittest
 import zipfile
 
-ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(
+    __file__.decode(sys.getfilesystemencoding()))))
 sys.path.insert(0, ROOT_DIR)
 
 from third_party.depot_tools import fix_encoding
 from utils import file_path
 from utils import zip_package
 
 
 def check_output(*args, **kwargs):
   return  subprocess.check_output(*args, stderr=subprocess.STDOUT, **kwargs)
 
@@ skipping 256 matching lines @@
         self.temp_dir,
         '321690737f78d081937f88c3fd0e625dd48ae07d-cert.pem')
     self.assertEqual(expected, actual)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()