cache_zonecut_callback() and find_deepest_zonecut() did not check staleness
cache_zonecut_callback() and find_deepest_zonecut() did not check staleness

each/bind9-collab,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab