Log source of log message instead of logger source

[mmacata]

With the current actinia logging implementation, log messages are passed to redis_fluentd_logger_base where they are initially logged. This way, it always logs as source e.g. /usr/lib/python3.8/site-packages/actinia_core-0.99.5.post0.dev18+g4d82691.dirty-py3.8.egg/actinia_core/resources/common/redis_fluentd_logger_base.py:104 instead of where the message was generated. To change this, refactoring would be necessary.