Log message in lib/ns/update.c needs updating

This message in lib/ns/update.c should report the actual type being ignored. It could be CDNSKEY, DNSKEY, or CDS.

                                                update_log(client, zone,
                                                           LOGLEVEL_PROTOCOL,
                                                           "attempt to "
                                                           "delete in use "
                                                           "DNSKEY ignored");