Migrate and merge logging_utils from swarming_bot into client/utils.

appengine/swarming/swarming_bot/bot_main.py

 # Copyright 2013 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.
 
 """Swarming bot main process.
 
 This is the program that communicates with the Swarming server, ensures the code
 is always up to date and executes a child process to run tasks and upload
 results back.
 
@@ skipping 10 matching lines @@
 import os
 import shutil
 import subprocess
 import sys
 import tempfile
 import time
 import traceback
 import zipfile
 
 import bot
-import logging_utils
 import os_utilities
 import xsrf_client
+from utils import logging_utils
 from utils import net
 from utils import on_error
 from utils import zip_package
 
 
 # Path to this file or the zip containing this file.
 THIS_FILE = os.path.abspath(zip_package.get_main_script_path())
 
 # Root directory containing this file or the zip containing this file.
 ROOT_DIR = os.path.dirname(THIS_FILE)
@@ skipping 481 matching lines @@
     logging_utils.set_console_level(levels[min(options.verbose, len(levels)-1)])
     if args:
       parser.error('Unsupported args.')
   except Exception as e:
     # Do not reboot here, because it would just cause a reboot loop.
     error = str(e)
   try:
     return run_bot(error)
   finally:
     call_hook(bot.Bot(None, None, None, ROOT_DIR, None), 'on_bot_shutdown')