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.
It speeds the test hugely by not starting/stopping a cache manager for each test. This is independent of the actual fix.