Migrate and merge logging_utils from swarming_bot into client/utils.

appengine/swarming/swarming_bot/__main__.py

 # Copyright 2014 The Swarming Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """Runs either task_runner.py, bot_main.py or bot_config.py.
 
 The imports are done late so if an ImportError occurs, it is localized to this
 command only.
 """
 
 __version__ = '0.3'
 
 import json
 import logging
 import os
 import optparse
 import shutil
 import subprocess
 import sys
 import zipfile
 
-import logging_utils
+from utils import logging_utils
 from utils import zip_package
 
 # This file can only be run as a zip.
 THIS_FILE = os.path.abspath(zip_package.get_main_script_path())
 
 
 # TODO(maruel): Use depot_tools/subcommand.py. The goal here is to have all the
 # sub commands packed into the single .zip file as a swiss army knife (think
 # busybox but worse).
 
@@ skipping 127 matching lines @@
       with zipfile.ZipFile(THIS_FILE, 'r') as f:
         logging.error('Files in %s:\n%s', THIS_FILE, f.namelist())
       return 1
 
   print >> sys.stderr, 'Unknown command %s' % cmd
   return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())