[BROOKLYN-92] Configure brokerName for ActiveMQ

Issue raised in jira: https://issues.apache.org/jira/browse/BROOKLYN-92
I believe we have these really long time outs because integration tests often take much much longer than you would expect when running on low powered CI machines (especially when it has low bandwidth and has to download and install the program). Although they can be annoying when running locally I think it's best we keep them in place.