QPID-5791: [Java Broker] Json store should synchronise on update too

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1598231 13f79535-47bb-0310-9956-ffa450edef68
QPID-5413: [Java Broker-Web Management] Allow stopping and starting of virtual host nodes and virtual hosts from the broker tab

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1598232 13f79535-47bb-0310-9956-ffa450edef68