notification tests assume JMS topic

[acoburn]

The test suite configuration will accept either a jms queue or a topic, but when run with a queue, the tests fail because, apparently, they are assuming the semantics of a topic. Specifically, the code starts up a listener, creates a resource and expects exactly two events. The problem is that, with a queue, there will be lots of events that preceded this occurrence, so the event count will be quite high (and definitely not == 2).