scrub: repair intra-node inconsistencies
Currently scrub repairs inter-node inconsistencies in object existence, xattrs, and size. There are a bunch of intra-node inconsistencies detected in ReplicatedPG::_scrub - which will be repaired if they aren't inconsistent on the authoritative peer.
If the authoritative node has such inconsistencies (i.e. mismatched object info size and on disk object size, missing xattrs, etc.) these will be propagated, instead of fixed.
These inconsistencies should be repaired if possible.