Updated openstack/openstack
Project: openstack/cinder  e53d10801fe370cbeeab0315091d15b431237cbb
null
Returns thin pool free space calculated from actual usage

This change adds a hidden method which calculates the thin
pool free space from the data_percent LVM options and reports it
accordingly in _update_volume_stats()

Change-Id: Id6a69644505ca10811db458ea90ed10f643054b2
Closes-Bug: 1249782