do not make hard-coded assumptions about any uid/gid

     Change: no-hard-coded-ugid
     Purpose: do not make hard-coded assumptions about any uid/gid
     Reason: OpenPKG can safely rely on the /etc/passwd and /etc/group
                     lookups for all uid/gid and has no need to assume
                     that for instance GID 0 is "root". Actually, such
                     an assumption is a portability problem as GID 0
                     under e.g. BSD is named "wheel" and not "root",
                     etc. As a result, things like "rpm -V" would report
                     wrong information, etc.