Listen on all addresses about hickory-dns

[bluejekyll]

Thanks for submitting this. I'll try and apply the patch you submitted and put up a PR as soon as I can. This might not be for a few days though.

[rbmj]

That sounds fine - next time I'll be less lazy and get github to do a proper fork for me.

[bluejekyll]

See the commit I just pushed. That incorporates your fix (mostly verbatum, though I made it fail a little nicer).

I wrote a new test harness for the named bin, which I had been planning on doing for a while, this gave me a good reason to. Anyway, you can run these tests with cargo test or more specifically cargo test --test z_named_test to test just ipv4 listeners, and both ipv4 and ipv6. I found at least on my mac that an ipv6 only listener is still routable from ipv4 via the standard ipv4 address mapping to ipv6, not sure if that is true on other OS'

edit: travis still has a bad ipv6 config, so I had to ignore the ipv6 test, you can test that with cargo test --test z_named_test -- --ignored

[bluejekyll]

I believe that the patch I submitted fixes this. If not please reopen.