[Samba] default backend = rid not showing full group information for users

[miguel medalha]

> Well, 'id' is showing me ALL the groups every single user is a member of.
Even for users belonging to 5 
> or 6 groups. I just confirmed it and nobody is logged in today. Like the
OP, I use the RID backend.

I also confirmed that 'id' shows me all the groups of certain users that
exist in AD for certain special purposes but that have NEVER logged in and
never will.