QPID-5761: Fix BDBHAVirtualHostNodeRestTest test failure caused by premature call to virtual host rest service before opening of virtual host

Patch Supplied by Andrew MacBean <andymacbean@gmail.com>.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1593930 13f79535-47bb-0310-9956-ffa450edef68