[bug#46668] [PATCH]: tests: do not hard code HTTP ports

[Maxime Devos]

Hi Guix,

I encountered a ‘Cannot listen to port: is bound’ error
or something like that when testing some changes to the
substituter.  I'm not sure yet what the cause is, but this
patch should eliminate some potential trouble, by not
hard-coding ports in tests that require a temporary http
server, and instead automatically assigning a free port.

Greetings,
Maxime

0001-tests-do-not-hard-code-HTTP-ports.patch
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