Resurrect the EJB security interceptor quickstarts.
[WFLY-2581] Port the ejb-security-plus quick start over to the new API.
[WFLY-2581] Update the ejb-security-interceptors quick start to use the new API.
Merge pull request #20 from darranl/security_interceptors

Restoration of 2 quick starts demonstrating switching identities using interceptors.