testsuite: add a functional2 test suite based on pytest

I am tired of bad shell scripts, let me write bad python quickly
instead. It's definitely, $100%, better.

This is not planned as an immediate replacement of the old test suite,
but we::jade would not oppose tests getting ported.

What is here is a mere starting point and there is a lot more
functionality that we need.

Fixes: https://git.lix.systems/lix-project/lix/issues/488

Change-Id: If762efce69030bb667491b263b874c36024bf7b6

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