QPID-4390: move the work dir defaulting and configuration fully within BrokerOptions


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1454940 13f79535-47bb-0310-9956-ffa450edef68
QPID-4390: change new sytem property names to include broker to allow distinguising them from any related client config. Separate defaults from the configurable value.


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1454941 13f79535-47bb-0310-9956-ffa450edef68