HPCC-11849 Roxie cores if persist rebuilt

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6188 from richardkchapman/roxie-persist-core

HPCC-11849 Roxie cores if persist rebuilt

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>