The ceph/halb host (ausyd1nxvm2069) publishes dashboard.ceph.unkin.net via
nsupdate to a dedicated 'zone ceph.unkin.net.', which bind-authoritative did
not serve (NOTZONE). Adds it as a primary dynamicUpdate zone alongside
unkin.net/main.unkin.net so the record has a home once the host-side
dns-update script is fixed.