Fix import of some autotest cros modules, make them callable outside of autotest runtime.

client/cros/dns_server.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import logging, threading, time, utils
+import logging, threading, time
+from autotest_lib.client.bin import utils
 
 class LocalDns(object):
     """a wrapper around miniFakeDns that handles managing running the server
     in a separate thread.
     """
 
     def __init__(self, fake_ip="127.0.0.1", local_port=53):
         import miniFakeDns  # So we don't need to install it in the chroot.
         self._dns = miniFakeDns.DNSServer(fake_ip="127.0.0.1", port=local_port)
         self._stopper = threading.Event()
         self._thread = threading.Thread(target=self._dns.run,
                                         args=(self._stopper,))
 
 
     def run(self):
         self._thread.start()
 
 
     def stop(self):
         self._stopper.set()
         self._thread.join()