HPCC-9340 Ecl packagemap delete needs a message when successful

Signed-off-by: Stuart Ort <stuart.ort@lexisnexis.com>
Merge pull request #4390 from stuartort/pkg_deletestatus

HPCC-9340 Ecl packagemap delete needs a message when successful

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>