LoggerFactory should check for SLF4J API instead of implementation.

[rob-valor]

Describe the bug
LoggerFactory should check for SLF4J API (org.slf4j.Logger) instead of the implementation (org.slf4j.impl.StaticLoggerBinder), just like it is done for Log4J2

Additional context
The issue now is that a message is incorrectly printed to the console, altough SLF4J is on the classpath and the com.atomikos.logging.Slf4jLogger instance is not used, but is should be.

I understand that this project is not intended for support - because bug reports may or may not be considered for inclusion some day (in a future release). If this is issue is important to me then I can go to https://www.atomikos.com/Main/SupportOverview and arrange a paid support subscription.

[pascalleclercq]

In that case, we may select sl4j logging framework without having any implementation in the classpath ? Do I miss something ?