QPID-4677: Rename broker and virtual host attribute constants to distiguish the global default settings for queues, connections and virtual hosts from own attributes

merged from trunk r1462550


git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/0.22@1463167 13f79535-47bb-0310-9956-ffa450edef68