Copy the __init__.py from openstack.common

Code has been added in the __init__.py now in the root
directory, so update.py needs to sync this file as well
earlier this file was empty, so we just used to ensure
that the file was created.

Change-Id: Ic9ebc43bce7a5a1ef414957b53055588dfc4d188
Merge "Copy the __init__.py from openstack.common"