HPCC-9184 Roxie queue name not found in /Status/Servers list after re-attach

The queue was not detecting that dali had disconnected properly, and was thus
failing to reconnect.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-9184 Roxie queue name not found in /Status/Servers list after re-attach

Minor changes following review

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4282 from richardkchapman/roxie-attach

HPCC-9184 Roxie queue name not found in /Status/Servers list after re-at...

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>