Fixes and add smoke test: hard timeout on isolated task.

client/utils/logging_utils.py

 # Copyright 2015 The Swarming 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.
 
 """Utility relating to logging."""
 
 import argparse
 import codecs
 import ctypes
 import logging
@@ skipping 135 matching lines @@
   def formatTime(self, record, datefmt=None):
     """Change is ',' to '.'."""
     ct = self.converter(record.created)
     if datefmt:
       return time.strftime(datefmt, ct)
     else:
       t = time.strftime("%Y-%m-%d %H:%M:%S", ct)
       return "%s.%03d" % (t, record.msecs)
 
 
-class Filter(logging.Filter):
+class Filter(object):
   """Adds fields used by the infra-specific formatter.
 
   Fields added:
   - 'severity': one-letter indicator of log level (first letter of levelname).
   """
 
   def filter(self, record):
     record.severity = record.levelname[0]
     return True
 
@@ skipping 124 matching lines @@
 
   def parse_args(self, *args, **kwargs):
     # Make sure this group is always the last one.
     self._add_logging_group()
 
     args = super(ArgumentParserWithLogging, self).parse_args(*args, **kwargs)
     prepare_logging(self.enable_log_file and args.log_file, self.logger_root)
     set_console_level(
         LEVELS[min(len(LEVELS) - 1, args.verbose)], self.logger_root)
     return args