QPID-5687 : [Java Broker] fix the initial config store to use "type" not "pluginType", add a test that checks the broker will startup with no config store.  Change the handling of ${amqp.qpid_port} and friends to allow setting through system properties

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1586938 13f79535-47bb-0310-9956-ffa450edef68