Fix LocalDiscovery synchronization and little memory leak

git-svn-id: https://svn.apache.org/repos/asf/cxf/dosgi/trunk@1539981 13f79535-47bb-0310-9956-ffa450edef68
Fix PublishingEndpointListenerFactory service leak (never being unregistered)

git-svn-id: https://svn.apache.org/repos/asf/cxf/dosgi/trunk@1539982 13f79535-47bb-0310-9956-ffa450edef68
Fix ZooKeeperDiscovery service and memory leaks due to starting multiple times in a row

git-svn-id: https://svn.apache.org/repos/asf/cxf/dosgi/trunk@1539983 13f79535-47bb-0310-9956-ffa450edef68