[PATCH] reliable name resolution in varnishtest

[Dridi Boukelmoune]

Hi,

Yesterday I had an idea to make it possible to reliably test a DNS
director, hoping to contribute one soon with a decent coverage. Today
I have come back to it and finished my prototype. I have already
discussed this patch's contents with phk and it's likely to be rejected
unless it manages to stay simple enough.

I'm submitting my prototype for a review, it's basically my initial idea
with phk's guidelines on how to work around the process isolation in
varnish. I haven't polished it yet, I could see a couple areas to slightly
improve, but nothing major.

Feedback greatly appreciated!

Best Regards,
Dridi
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