[master] 808be2b0c bring back "feature dns" after the canary has fallen over

[Poul-Henning Kamp]

--------
In message <20191216111906.1C8A95B45 at lists.varnish-cache.org>, Nils Goroll writ
es:

>    bring back "feature dns" after the canary has fallen over
>    
>    $ nslookup dns-canary.freebsd.dk

We need to bring this canary into the varnish.org domain.

It is important that it return a recognizable IP# so that
you don't get false positives from lying resolvers in hotels
and shitty ISPs.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.