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.
Is the cleanup required after test still?  I would think if we are properly removing the listener we should okay or is it that data is an issue as well?