OPENDJ-2725 Set message categories for tools who use JDK logging instead of the server custom logger

Tools use a logger based on JDK logging, while the server implements a slf4j logger.
When logging, the original LocalizableMessage is lost when JDK logging is used, so there is no information on the resource to map to the category.
Revert to using the source class of the message for determining categories via a secondary map.