Windup 102: Refactor java legacy rules

The only thing I need to discuss is java-gate that is present twice and I didnt migrate it till now.
For example here: https://github.com/windup/windup-legacy/blob/master/application/rules/src/main/resources/windup/java/java-weblogic-config.windup.xml
flags the whitelist - file being ignored by windup.. however you are right this needs some more work to be done to actually work. We should discuss if that's the useful usecas (having whitelists)