Move site_backchannel and site_tpm module into client/cros dir.

client/site_tests/network_3GDormancyDance/network_3GDormancyDance.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
 
 import dbus, dbus.mainloop.glib, gobject
 import glib
 
 from autotest_lib.client.cros import flimflam_test_path
 import flimflam
 
 class network_3GDormancyDance(test.test):
     version = 1
@@ skipping 65 matching lines @@
             self.device = self.flim.FindElementByPropertySubstring('Device',
                                                                    'Interface',
                                                                    name)
         self.bus.add_signal_receiver(self.PropertyChanged,
                                      signal_name='PropertyChanged')
         self.bus.add_signal_receiver(self.DormancyStatus,
                                      signal_name='DormancyStatus')
         self.mainloop = gobject.MainLoop()
         glib.idle_add(self.begin)
         self.mainloop.run()