3.0a21: add a new group using ACL results in a new user in winbindd idmap

[Chere Zhou]

I am in an ADS domain.  From a Windows client, create a file, add a group to 
the file using ACLs (new means the group is not in winbindd database yet), 
the group is mapped as a user in the winbindd_idmap.tdb.  The group is not 
any special type, just a normal group (not local, not universal).  

Anyone knows about this problem?

Thanks,
Chere