[ldns-users] Various fixes

[Vitaly Magerya]

Miek Gieben wrote:
>> ldns_rdf_address_reverse always uses IP6.ARPA domain when reversing IPv6
>> addresses, while bind9-host (and thus ldns-host) allows choosing between
>> IP6.ARPA and IP6.INT.
> 
> OK. But you are aware that IP6.INT has been deprecated long ago?
> https://www.ietf.org/rfc/rfc4159.txt

I am. I still want to support it though, since a major goal of ldns-host
is to be a drop-in replacement for bind9-host.