HPCC-9245 Packagemap needs to support mixed case package ids

Signed-off-by: Stuart Ort <stuart.ort@lexisnexis.com>
Merge pull request #4345 from stuartort/pkg_listcore

HPCC-9245 Packagemap needs to support mixed case package ids

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>