AS7-6561 EJB 3.2 spec support - TimerService#getAllTimers()

The commit here adds support to the new API introduced in EJB 3.2 for TimerService. This also includes a testcase for testing that API.

There's one commit in here, which fixes a bug unrelated to this feature, but it was exposed by the testcase that was added for this feature. I believe that bug only affects "master" since it appears to have been related to the recent refactoring we did in timers.