- This is to make use of loopback devices for ceph osds since
support for directory backed osds going to deprecate.
- Move to bluestore from filestore for ceph-osds.
- Seperate DB and WAL partitions from data so that gates will validate
the scenario where we will have fast storage disk for DB and WAL.
Change-Id: Ief6de17c53d6cb57ef604895fdc66dc6c604fd89