HPCC-11972 Roxie data copying majority from remote Roxie and not buddy node

Need to recheck whether buddy is present immediately before copy.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-11972 Roxie data copying majority from remote Roxie and not buddy node

Added unit test code to confirm was working as expected.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6458 from richardkchapman/roxie-pull-buddy

HPCC-11972 Roxie data copying majority from remote Roxie and not buddy node

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>