[$] Multi-host testing with the pytest-mh framework

The pytest-mh
project is a plugin that provides a multi-host test framework for the
popular pytest
unit-testing framework and test runner. Work on pytest-mh
started in 2023 to solve a multitude of issues that
cropped up for developers and testers when testing the SSSD project, which is a client for
enterprise identity management. I was not happy with the state of
testing of the SSSD project and wanted to create something that would
increase test readability, remove duplication, eliminate errors, and
provide multi-host testing capabilities, while having the flexibility
to build a new API around it. Finally, I also wanted something that
can be used by anyone to test their projects as well.