remove use of graduated modules

[Doug Hellmann]

The fixtures and code associated with lockutils are in oslo.concurrency now, so we should use those copies instead of the incubated versions.

[Doug Hellmann (doug-hellmann)]

https://review.openstack.org/151836

[Steve Martinelli (stevemar)]

also addressed by: https://review.openstack.org/#/c/152806

[Steve Martinelli (stevemar)]

and https://review.openstack.org/#/c/152805/1

[Steve Martinelli (stevemar)]

Once the last three are merged we can mark this bug as fix-committed, i doubt https://github.com/openstack/oslo.policy/blob/master/oslo_policy/openstack/common/fileutils.py will be graduating any time soon

[Steve Martinelli (stevemar)]

I think this is complete now, addressed by: https://review.openstack.org/#/c/151829/ https://review.openstack.org/#/c/152806/ and https://review.openstack.org/#/c/153367/