HPCC-9567 Ignore (unreliable) numDataCopies value in overloaded mode

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4561 from richardkchapman/overload-numdatacopies

HPCC-9567 Ignore (unreliable) numDataCopies value in overloaded mode

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>