QPID-4738: Fix qpid-ha status --all when used with a standalone broker.

Previously qpid-ha status --all on a standalone broker produced no output.
Now it prints the status of the standalone broker.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1580962 13f79535-47bb-0310-9956-ffa450edef68