[WFCORE-22] Portiong version 1.6 of the management schema to WildFly.

Also a change to the default handling within the switch blocks so that the major version can be taken into account. i.e. In the future when we add support for version 1.7 remove the need to identify every location that 1.6 was given special handling.

Note: Once merged a Final release of WildFly Core should not be released until we are sure this schema has been release in a GA EAP release.
This broke AppClientXml in wildfly. I'll send up a fix.