This builds on Michał's work implementing
rndc as Pytest fixtures.
Things I added:
dig and grepping its output)
copy_setports, I have to set up the
jinja2 dependency properly though)
I then rewrote partially the
emptyzones test using these. Partially, because I failed to find a way to hook into the current pytest machinery in such a way that would allow me to remove the initial templating in