Use different logging facilities for tests

[foursixnine]

Stemming from https://github.com/openSUSE/qem-bot/pull/154/files#diff-875b177346dbec68b9589c3e36b1afd20543e8fb36e9c98652ef56b3e8862828R161

Since Python logging doesn't seem to support trace level events, maybe the way could be use different filters/facilities to have better tracing during development without needing to rely on commenting code, that's only useful when modifying implementation of things

https://docs.python.org/3/howto/logging.html