WFLY-507 EJB 3.2 - Allow TimerService#getAllTimers() to be functional from stateful beans

https://issues.jboss.org/browse/WFLY-507. The commit here is related to adding EJB 3.2 support in WildFly. 

This commit now allows stateful EJBs to invoke the (new) Timerservice#getAllTimers() method from within the stateful bean. The commit also includes a test to verify this functionality.