Loader: Return to default simplelogger properties

[istreeter]

RDB loader is unusual among Snowplow apps as we override the default simplelogger properties:

org.slf4j.simpleLogger.showLogName=false
org.slf4j.simpleLogger.showThreadName=false

I think this was done because historically we were grepping the logs to look for errors. But these days RDB loader has in-built monitoring and reporting. Was there any other reason we changed the defaults?

I think it would be helpful for debugging loader problems if we could see log names and thread names in the production logs.