Updated openstack/openstack
Project: openstack/sahara  7fa07d96996bc7656e63e7792c5b140c95fd7c24

Update oslo lockutils module

Changes -
 * Use file locks by default again
 * Fix E126 pep8 errors
 * Remove oslo.log from lockutils
 * Fix deletion of cached file for policy enforcer

Change-Id: I933a5ac10c70d9ea99c7648c7dd5651706724067