Refactor the lvm barbican job(s): cinderlib-less variant

The first real cinderlib supported branch works with train,
so restructure the lvm/barbican jobs to disable cinderlib testing
with any branch older than train.
While those branches are in Extended Maintenance status,
the job may be still used there to remove their old legacy
counterpart to easy the maintenance.

Change-Id: I5fa1b2d0348e86988f616dd7404dedc4eb9c4666
1 file changed