Btest

* Python cleanup (Benjamin Bannier, Corelight)

- Use `locale.getlocale` instead of deprecated `locale.getdefaultlocale`.

- Remove code for Python 2 compatibility.

- Use `python3` instead of `python` binary in test. Newer versions
of e.g., macOS do not provide a `python` binary anymore.

* Bump pre-commit checks. (Benjamin Bannier, Corelight)

* Remove dependency on distutils. The distutils module will be
removed from Python in 3.12. (Cyril Rolando)

* Make test `duplication-selection` independent of actual
scheduling.

* Avoid assertion failure if same test required multiple times.
(Benjamin Bannier, Corelight)

* Add PartInitializer option (Christian Kreibich, Corelight)

* Support for global and test-part teardowns (Christian Kreibich, Corelight)

* Remove Python 2.7 from manifest (Christian Kreibich, Corelight)

* Add flag `-l` to print available tests. (Benjamin Bannier,
Corelight)