QPID-5719: HA becomes unresponsive once any of the brokers are SIGSTOPed

Fixed typo in qpidd script that was causing this not to work if a backup
was SIGSTOPed.

Also fixed bug where data-dir setting in qpidd.conf was being ignored.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1611790 13f79535-47bb-0310-9956-ffa450edef68