[WFLY-2668] Cannot execute "ssh $USER@$HOST service wildfly-init-redhat.sh restart" correctly in domain mode
This fixes a few issues with JASPI:

* Pre-emptive authetication (AUTH_SUCCESS & null UserPrinciplal
handling) (spec 3.8.3.1)
* Always call secureResponse (spec 2.5.1.2 Point(3))
* Properly fill org.jboss.security.SecurityContext by using
org.jboss.security.auth.callback.JASPICallbackHandler, so that EJB
propgation has a chance to work
Merge pull request #5638 from darranl/jaspi-undertow-fixes

JASPI Fixes
Merge pull request #5632 from leathersole/WFLY-2668

[WFLY-2668] Cannot execute "ssh $USER@$HOST service wildfly-init-redhatsh restart" correctly in domain mode
Undertow & XNIO Update