[GSS] (7.0.z) EJB run-as identity gets lost if an unsecured ejb in the call stack

Having an unsecured EJB in the call stack will cause the RunAs identity to get lost.

An example might look like this:

unsecured web app (RunAs: JBossAdmin) -> unsecured HelloBean EJB -> secured GoodBye EJB (RolesAllowed: JBossAdmin)

This will fail as the unsecured ejb causes the RunAs identity to get dropped/lost.