QPID-5634: Remove virtualhost level attribute, securityAcl, which was made obsolete by this change.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1590081 13f79535-47bb-0310-9956-ffa450edef68
QPID-5715: [Java Broker] Defect fix - when stop the VHN before deleting it

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1590082 13f79535-47bb-0310-9956-ffa450edef68