Updated openstack/openstack
Project: openstack/oslo.db  39c63e7923c850b63633014e1980ac6a0121e733

Use six.wraps instead of functools.wraps

The six module provides a helper wraps function that correctly
tracks the original wrapped function in python 2.x and 3.x so
use it where we can so that we maintain better compatability with
3.x

Change-Id: Ifa994bf63153f58f0aa1f6203a963ac7312ac2b1