General Description:
Fix for map_maintainer producing duplicate entries

Detailed Description:
map_maintainer produces mappings with duplicate entries which causes inaccurate reports when using
these mapping files.This patch contains the fix so that map_maintainer will produce unique mapping
entries for virtual, license-single and license-multi type mappings.

General Description: Fix for map_maintainer long processing time

Detailed Description: 
Active directory records that has no proper unique id causes too much processing time of
map_maintainer. To prevent this issue, map_maintainer will skip the generation of empty id and log a
warning about the number of ignored records in debug.