HPCC-9800 Remove unused checkPrimaries option in Roxie

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4838 from richardkchapman/no-checkPrimaries

HPCC-9800 Remove unused checkPrimaries option in Roxie

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>