Use proper dyndns-url URLs for nsupdate.info
Use proper dyndns-url URLs for nsupdate.info

The update URLs for nsupdate.info changed to the prefixed versions (ipv4. , ipv6.).
Therefore the current preset is not working out of the box. Anymore, since dyndnsc is
getting a 401 bad auth response on the former URL.
infothrill/python-dyndnsc,infothrill/python-dyndnsc