QPID-6011 : [Java Broker] provide a mechanism for disabling plugins and implementation types

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1618531 13f79535-47bb-0310-9956-ffa450edef68
QPID-6011 : [Java Broker] change plugin exclude naming mechanism to be more user-friendly

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1618533 13f79535-47bb-0310-9956-ffa450edef68