Maintenance: Improve ensure_threads_exited test support handler.
Maintenance: Improve ensure_threads_exited test support handler.

monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad,zammad/zammad,zammad/zammad,monotek/zammad,monotek/zammad