Fail2ban improvements

[0xMentorNotAPseudo]

@d-jorg a little review of this MR:

• You should rename some file such as fail2ban_class.py .. For example, if we look into your class we clearly see that your managing business logics. Maybe calling your file fail2ban_service.py and your class Fail2banService would be better.

• you should refactor the logging configuration at level package. We should use per package configuration (or even better a global per project approach).

• Also, maybe securing your __log_and_dump function would be good (at least handling potential exceptions).

• Finally, the most important thing: adding both unit and integration tests for fail2ban :-)

[d-jorg]

#8 WIP