[Backlog] Orphan File Cleanup

[irq0]

What needs to be done

Remove orphaned files and metadata in the database. On startup is likely a good time for this.

Why it needs to be done

Certain error conditions may leave data unreadable by the client behind.

Example: A crash/connection reset during a put object leaves a object in state OPEN and possibly data on disk. get object will never return this data as it is not in state COMMITTED.

Acceptance Criteria

Additional Information

Best to tackle this after https://github.com/aquarist-labs/ceph/pull/119 and #129

[l-mb]

Related to #624 ?