156003: Avoid verbose logging to System.out in the LoggerFactory
Some people complained about us logging to System.out when init-ing the logging subsystem, like this:
No org.slf4j.impl.StaticLoggerBinder found in ClassPath, trying with log4j2... No org.apache.logging.log4j.Logger found found in ClassPath, trying with log4j...
This has now been fixed: we no longer log to System.out in that case.