ipv6-only dns resolution

[onehalf3544]

As suggested in this message, it should be possible to resolve IPv6 address using IPv6 only, i.e.:

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dig -6 aaaa user.domain

should succeed.

[kasperd]

There could also be a test the other way around like this one: http://ds.v6ns.test-ipv6.com/

That one is of course much easier to pass (so easy I might have forgotten if it was even part of the certification in the first place).