Security subsystem fixes

Adds missing transformers, fixes marshalling of some attributes, and makes the security subsystem transformers stateless.

https://issues.jboss.org/browse/WFLY-2474
https://issues.jboss.org/browse/WFLY-2475
https://issues.jboss.org/browse/WFLY-2476
https://issues.jboss.org/browse/WFLY-2530