[bug#28055] [WIP] Add knot tests

[Julien Lepiller]

Hi,

This patch aims at adding a system test for knot. I've implemented the
DNS protocol to be able to communicate with the server and try some
queries. Unfortunately, although the server seems to be launched (the
first test passes), it then refuses to answer. Do you see anything
wrong, or anything I could do to understand why it doesn't pass?

Thanks :)

0001-gnu-tests-Add-dns-test.patch
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