QPID-4758: Extend the qpidd --wait option to work at shutdown
Patch from Ernie Allen and Pavel Moravec.
Note: This patch is for the posix platform broker; The windows broker does not use a --wait option and is unaffected by this patch.



git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1471442 13f79535-47bb-0310-9956-ffa450edef68