GPAUDITLOGGING-65 Configuration option for logging full class name

It would be better in my opinion if you leave the defaults (and the tests for it) as is, and test the new optional feature by an own test were you disable the logFullClassName config value. This needs your AuditLogListener changes to be tweaked a bit, so you check the concrete config value of logFullClassName in getClassName(entity).

Currently, we set the most commonly used options in the audit-test Config.groovy file and additionally test the other config cases, too. E.g. verbose / non verbose logging.

Is that ok for you? Opinions welcome.