Using __del__ is somewhat unsound resource cleanup in our clase the
logger already closed its logfile and therefor fails with exception
before the rest of the resources can be cleaned up.
Now that we have a QMP client, we can wire it up in the test driver.
For now, it is almost completely useless because of the need of a constant "event loop", especially
for event listening.
In the next commits, we will slowly enable more and more usecases.