osd/scrub: discard repair_oinfo_oid()

osd/scrub: discard repair_oinfo_oid()

repair_oinfo_oid(), called every scrub, has a very specific
functionality: fix the object ID specified in the Object Info
attribute, if different from the ID of the owning object.

This fix was added in 2017, as a response to a unique failure
scenario that was observed in Sepia - probably following a
filesystem bug. See https://tracker.ceph.com/issues/18409 &
https://tracker.ceph.com/issues/20471.

The limited functionality of repair_oinfo_oid() -
only repairing this one specific issue, and only if the OI_ATTR
exists and is decodable - does not justify the overhead of
running it every scrub.

Signed-off-by: Ronen Friedman <rfriedma@redhat.com>