[WFLY-3978] - PicketLink EAP 6.4 Issues

[BZ-1155492] - PicketLink Subsystem dissapears after removing last federation after reload.
[BZ-1155501] - Adding empty PicketLink Subsystem causes disappearance of another PicketLink Subsystem
[BZ-1151002] - Class-name/code attributes causes conflicts in PicketLink Federation subsystem.
It can't happen, it should be removed :-)