ceph_volume_client: modify data layout in meta files
Notable changes to data layout in auth meta and volume meta files:
In the auth meta files, add a 'dirty' flag to track the status of auth
updates to a single volume.
In the volume meta file, make the 'dirty' flag track the status of
auth updates for a single ID.
Optimize the recovery of partial auth update changes to auth meta,
volume meta, and the Ceph backend, facilitated by changes in the
data layout in the meta files.
Signed-off-by: Ramana Raja <rraja@redhat.com>
(cherry picked from commit
7c8a28a7e817d030a4d419b0cc627c30c1064270)