Added some extra fields to the auth_serversupplied_info structure.

Added some extra fields to the auth_serversupplied_info structure.
To obtain the full group membership of a user (i.e nested groups on a
win2k native mode server) it is necessary to merge this list of groups
with the groups returned by winbindd when creating an nt access token.

This breaks winbindd linking while AB and I sync up our changes to the
authentication subsystem.