Small fixes as found in staging.

appengine/swarming/swarming_bot/api/platforms/android.py

 # Copyright 2015 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.
 
 """Android specific utility functions.
 
 This file serves as an API to bot_config.py. bot_config.py can be replaced on
 the server to allow additional server-specific functionality.
 """
 
 import collections
 import logging
 import os
 
 
 from adb import adb_commands_safe
+from adb import adb_protocol
+from adb import common
 from adb import high
 
 
+LEVEL = logging.WARNING
+adb_commands_safe._LOG.setLevel(LEVEL)
+adb_protocol._LOG.setLevel(LEVEL)
+common._LOG.setLevel(LEVEL)
+high._LOG.setLevel(LEVEL)
+
+
 def initialize(pub_key, priv_key):
   return high.Initialize(pub_key, priv_key)
 
 
 def get_devices(bot):
   return high.GetDevices(
       'swarming', 10000, 10000, on_error=bot.post_error if bot else None,
       as_root=True)
 
 
 def close_devices(devices):
   return high.CloseDevices(devices)
+
+
+def kill_adb():
+  return adb_commands_safe.KillADB()