HPCC-11688 unused-files shouldn't check packagemaps active on other roxies

Packagemaps used need to be associated with a target that is loaded on the
given roxie process cluster.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #6064 from afishbeck/unusedFileActiveMapSelection

HPCC-11688 unused-files shouldn't check packagemaps active on other roxies

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>