HPCC-10444 Regression Suite failed in overnight build and test

Fix cluster listing problem

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #5161 from AttilaVamos/HPCC-10444-fix

HPCC-10444 Regression Suite failed in overnight build and test

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>