QPIDJMS-27: update link closing to use events to signal completion

git-svn-id: https://svn.apache.org/repos/asf/qpid/jms/trunk@1619139 13f79535-47bb-0310-9956-ffa450edef68
QPIDJMS-27: update connection closing to use events to signal completion

git-svn-id: https://svn.apache.org/repos/asf/qpid/jms/trunk@1619140 13f79535-47bb-0310-9956-ffa450edef68