luci-py: Making __file__ usage unicode safe.

client/tools/run_on_bots.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 """Automated maintenance tool to run a script on bots.
 
 To use this script, write a self-contained python script (use a .zip if
 necessary), specify it on the command line and it will be packaged and triggered
 on all the swarming bots corresponding to the --dimension filters specified, or
 all the bots if no filter is specified.
 """
 
 __version__ = '0.1'
 
 import os
 import tempfile
 import shutil
 import subprocess
 import sys
 
-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()))))
 
 # Must be first import.
 import parallel_execution
 
 from third_party import colorama
 from third_party.depot_tools import fix_encoding
 from utils import file_path
 from utils import tools
 
 
@@ skipping 148 matching lines @@
       isolated_hash,
       name,
       bots)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   tools.disable_buffering()
   colorama.init()
   sys.exit(main())