[Samba] Domain group membership.

[Adam Nielsen]

> Hmm..this is interesting.  It seems that getent may fail if there are
> a large number of users in a domain group.

Actually when I try that I get thousands of users listed, so it looks
like it works at least some of the time...

Unfortunately by doing that I run out of UIDs to map users to (it seems
that 65,536 UIDs isn't enough) so I only did it the once ;-)

Cheers,
Adam.