UIDs and GIDs files are getting full. I have identified instances where
a port did not require both a UID and a GID, so the committer only
created one entry. As a result, it makes it significantly more difficult
to identify which UIDs and GIDs are "free" and if future updates of the
software warrant the usage of a UID or GID it will become messy as the
matching ID may not be available.
This diff creates groups where only a user existed and creates
"reserved" users where only the group existed.