QPID-5867: [Java Broker] Allow the virtualhost's permitted node list to passed via the virtualhostnode's virtualhost blueprint context variable.

Work completed by Andrew MacBean <macbean@apache.org> and me.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1612064 13f79535-47bb-0310-9956-ffa450edef68