Move site_backchannel and site_tpm module into client/cros dir.

client/site_tests/network_3GSmokeTest/network_3GSmokeTest.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.
 
-from autotest_lib.client.bin import site_backchannel, test, utils
+from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
+from autotest_lib.client.cros import backchannel
 
 import logging, re, socket, string, time, urllib2
 import dbus, dbus.mainloop.glib, gobject
 
 from autotest_lib.client.cros import flimflam_test_path
 import flimflam, routing, mm
 
 SERVER = 'testing-chargen.appspot.com'
 BASE_URL = 'http://' + SERVER + '/'
 
@@ skipping 202 matching lines @@
             if len(self.GetModemInfo()) != len(modem_info):
                 logging.info('NewInfo: %s' % ', '.join(self.GetModemInfo()))
                 raise error.TestFail('Test shutdown: '
                                      'failed to leave modem in working state.')
 
             if sleep_kludge:
               logging.info('Sleeping for %.1f seconds', sleep_kludge)
               time.sleep(sleep_kludge)
 
     def run_once(self, connect_count=5, sleep_kludge=5):
-        site_backchannel.setup()
+        backchannel.setup()
         time.sleep(3)
         self.flim = flimflam.FlimFlam()
         self.device_manager = flimflam.DeviceManager(self.flim)
         try:
             self.device_manager.ShutdownAllExcept('cellular')
             self.run_once_internal(connect_count, sleep_kludge)
         finally:
             try:
                 self.device_manager.RestoreDevices()
             finally:
-                site_backchannel.teardown()
+                backchannel.teardown()