https://issues.apache.org/jira/browse/AMQ-4160 - fix up multicast discovery regression - it was giving uniqueue events to add/remove. MulticastDiscoveryOnFaultyNetworkTest - added static variant to that test also to validate existing changes

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1428901 13f79535-47bb-0310-9956-ffa450edef68