luci-py: Making __file__ usage unicode safe.

client/tools/isolateserver_load_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.
 
 """Uploads a ton of stuff to isolateserver to test its handling.
 
 Generates an histogram with the latencies to download a just uploaded file.
 
 Note that it only looks at uploading and downloading and do not test
 preupload, which is datastore read bound.
 """
 
 import functools
 import json
 import logging
 import optparse
 import os
 import random
 import sys
 import time
 
-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 import colorama
 
 import isolateserver
 
 from utils import graph
 from utils import threading_utils
 
 
@@ skipping 210 matching lines @@
   print('')
   print_results(results, options.columns, options.buckets)
   if options.dump:
     with open(options.dump, 'w') as f:
       json.dump(results, f, separators=(',',':'))
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())