INT-2989 Increase JMS Test Timeouts

The default 5 second timeout is insufficient in some cases
for the larger volume tests. In most cases, increase to
10 seconds; in some cases to 30 seconds.

Also, add code to keep the ActiveMQ VMTransport running for
the entire test class (by keeping a connection open).

Avoids cycling the broker, which can cause other issues.

Also close the context in a finally block in PipeLineJmsTests.