org.jboss.as.controller.descriptions.StandardResourceDescriptionResolver#getVariableBundleKey method is copied, with minor modification, to ThreadPoolResourceDescriptionResolver, and org.wildfly.extension.batch.jberet.thread.pool.BatchThreadPoolResourceDefinition.BatchThreadPoolDescriptionResolver.

We should make this method protected and static so that it can be shared with subclasses. After that, the copied methods in other 2 places can be removed.