ISPN-4478 ServerFailureRetrySingleOwnerTest should remove listener

* Before, the error inducing listener was not being removed, and that was not appearing as a result that each test was creating a new bunch of cache managers. Now, clean up is done after the test class has finished and the listeners are correctly removed.
Sorry I for some reason got AFTER_TEST and AFTER_METHOD mixed up :)  We are on the same page :)