net-analyzer/fail2ban: port to python-single-r1

The package isn't suitable for PEP517, as it installs data files and
it simply happens to be written in Python, rather than intending to be
imported and so on.

Unfortunately, for the remaining PEP517 holdouts, there's little pressure
upstream for them to port to a proper build system yet, as while setuptools
deprecated the `setup.py` entrypoint some time ago, there's no removal
in sight yet, so the only pressing side is on Gentoo's where we want
to cleanup distutils-r1's support for that.

It was arguably a mistake to really have these packages use distutils-r1
in the first place.

The obvious workaround for now is to invoke setup.py manually w/ python-single-r1,
and punt the question until setuptools removal of the entrypoint looks
closer (at which time, other distros will be putting pressure on upstreams
too). Of course, if at the time of such a setuptools change, the package
is still not fixed, then we'd have to remove it.

(The same issues apply to bug #923080 which isn't fixed by this, but
hopefully won't be an actual problem until that aforementioned removal
in setuptools itself of the other bits.)

Bug: https://bugs.gentoo.org/923080
Closes: https://bugs.gentoo.org/909998
Signed-off-by: Sam James <sam@gentoo.org>

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