Merge branch 'closedown-4.2.x' into candidate-4.2.2

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-10592  Roxie needs to cache dali lookups that fail to match

Otherwise an erroneous packagemap can be catastrophic

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-10602 OVERWRITE option broken in roxie

A regression caused by the fixes to HPCC-10564, and not in any released build.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #5245 from richardkchapman/roxie-package-cache2

HPCC-10592 Roxie needs to cache dali lookups that fail to match 

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
HPCC-10533 Fix EnvGen segmentation fault

  - Regression

Signed-off-by: Gleb Aronsky <gleb.aronsky@lexisnexis.com>