HARD LINKS
* vnop_lookup is to keep the name if hardlinks (z_links) are detected
* vnop_getattr is to return the name in va_name when hardlinks are used
Name is currently stored in z_node as static area, could be changed.

* Remove no longer needed z_reclaimed entry, as we sleep in zget rather than
  free in 2 locations.
* Bring back readdirattr, and fix the ".zfs" entry bug
Could be updated to add .zfs into readdirattr for Finder to see it.