Issue 50615 - Log current test name to journald
    
    Bug Description:
    Sometimes server crashes during test execution, events about crash are
    logged to journald. But it's not easy to tell in which test the crash
    happened, especially during the full test run.
    
    Fix Description:
    Add a fixture that is used automatically for all tests (if the server is
    built with systemd) on setup and teardown, and logs a message to journald
    
    Fixes: https://pagure.io/389-ds-base/issue/50615
    
    Reviewed by: mreynolds (Thanks!)