Update XP Manager for XP 3

I am using a Task in JBEAP to track this. The ground work was done as EAP7 requirements for XP1 and XP2. It is now a question of a few lines of pom adjustment when we release a new XP.

The feature branch is at https://github.com/jbossas/jboss-eap-xp-patch-stream-manager/tree/xp3-dev