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

The pytest-mhproject is a plugin that provides a multi-host test framework for thepopular pytestunit-testing framework and test runner. Work on pytest-mhstarted in 2023 to solve a multitude of issues thatcropped up for developers and testers when testing the SSSD project, which is a client forenterprise identity management. I was not happy with the state oftesting of the SSSD project and wanted to create something that wouldincrease test readability, remove duplication, eliminate errors, andprovide multi-host testing capabilities, while having the flexibilityto build a new API around it. Finally, I also wanted something thatcan be used by anyone to test their projects as well.