HPCC-11496 Avoid create/delete ClusterLock to reduce contention

Ensure ClusterLock is present and avoid constant commits, which
causes a lot of write/exclusive contention in Dali.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #5925 from jakesmith/hpcc-11496

HPCC-11496 Avoid create/delete ClusterLock to reduce contention     

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>