QPID-5821: [Java Broker] Refactor MessageStore and DurableConfigurationStore interfaces to remove message store settings map.

VirtualHost model objects now have attributes.

Work done by Keith Wall <kwall@apache.org> and me.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1605737 13f79535-47bb-0310-9956-ffa450edef68
QPID-5821: Remove unused settings interface incorrectly committed

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1605742 13f79535-47bb-0310-9956-ffa450edef68