s3: route versioned/suspended delete markers and versioned COPY off the lock
createDeleteMarker flips the .versions pointer via routedVersionedFinalize
(RECOMPUTE_LATEST on the owner filer) when an owner is known, so an Enabled or
Suspended DeleteObject takes its pointer flip off the distributed lock; the
delete marker file is written first and the owner re-derives the pointer.
DeleteObjectHandler routes a versioned/suspended delete with no specific version
straight to the owner, off the lock. A specific-version delete and object-lock
buckets keep the lock (the former needs a recompute-after-delete handled
separately; the latter needs gateway-side enforcement).
CopyObject into a versioned bucket finalizes the new version through the same
routed pointer flip.
Chris Lu
4b9d46b5ad