HPCC-12453 Add --limit parameter to ecl getname command.

Add --limit to ecl getname command.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #6570 from AttilaVamos/HPCC-12453-improvement

HPCC-12453 Add --limit parameter to ecl getname command.

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>