Re-enable Ceph in live migration testing
Re-enable Ceph in live migration testing

Revert I05182d8fd0df5e8f3f9f4fb11feed074990cdb9f and
Add fix to enable proper OS detection.

Closes-Bug: #1819944

Co-Authored-By: Jens Harbott <j.harbott@x-ion.de>

Change-Id: Iea6288fe6d341ee92f87a35e0b0a59fe564ab96c

klmitch/nova,rahulunair/nova,mahak/nova,mahak/nova,rahulunair/nova,klmitch/nova,openstack/nova,mahak/nova,klmitch/nova,klmitch/nova,rahulunair/nova,openstack/nova,openstack/nova