luci-py: Making __file__ usage unicode safe.

client/tools/swarming_load_test_bot.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.
 
 """Triggers a ton of fake jobs to test its handling under high load.
 
 Generates an histogram with the latencies to process the tasks and number of
 retries.
 """
 
 import hashlib
 import json
 import logging
 import optparse
 import os
 import Queue
 import socket
 import StringIO
 import sys
 import threading
 import time
 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 import colorama
 
 import swarming
 
 from utils import graph
 from utils import net
 from utils import threading_utils
 
@@ skipping 288 matching lines @@
   results = list(events.queue)
   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())