HPCC-9021 Non-locking mode for single-node / dev roxies

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4156 from richardkchapman/roxie-dynamic

HPCC-9021 Non-locking mode for single-node / dev roxies

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>