Create a cros directory under client, and start moving things into it.
The first step only includes chromeos_constants.py. But you get the idea how the others will look like.

Change-Id: I0a601a53e4d9a43f06e9f9f67429ac780f2562d0

BUG=7236
TEST=bvt test

I dont worry too much about occasional break ups caused by this, since I will continues working on this refactoring and this is just the beginning.

Review URL: http://codereview.chromium.org/5519008
diff --git a/client/common_lib/cros/autoupdater.py b/client/common_lib/cros/autoupdater.py
index 311bd58..3ed6105 100644
--- a/client/common_lib/cros/autoupdater.py
+++ b/client/common_lib/cros/autoupdater.py
@@ -8,8 +8,8 @@
 import socket
 import urlparse
 
-from autotest_lib.client.bin import chromeos_constants
 from autotest_lib.client.common_lib import error
+from autotest_lib.client.cros import constants as chromeos_constants
 
 STATEFULDEV_UPDATER = '/usr/local/bin/stateful_update'
 UPDATER_BIN = '/usr/bin/update_engine_client'