Handler Unit Test Bug

Motivation:
There is a bug in the JettySslEngineTest where the interface receiving a message does not do a latch.countDown().
This causes each test to be subject to the CountDownLatch timeout period instead of being notified right when an event occurs.

Modifications:
- The JettySslEngineTest message handler will call the appropriate latch.countDown after a message is received

Result:
JettySslEngineTest will not be subject to waiting the timeout period even if the message is correctly received