Andrew Bartlett 6f32fa2349 Remove 'unixsam' from the default passdb backends. ...

The intention is to remove the muliple passdb backends, but we need the
'guest' account to always be there.  If the admin adds the guest account to
(say) LDAP, there will only be one backend required for operation.

This helps remove some nasty behaviours with adding accounts to the system
for both the RPC 'create user' and the SAMSYNC code.  Users 'added' with
an 'add user/machine' script won't magicly appear, and machine accounts
'pre-added' to unix, but not the smbpasswd file will not cause mayhem.

This commit also implements somthing tridge discussed with me, the concept
of 'default' passdb operation pointers - so that each backend does not
need it's own stub funcitons wrapping the default tdb privilages/group
mapping code.

This also removes an implicit 'sid->name' and 'name->sid' mapping from our
own local SID space, to winbind usernames.  When adding mapping for NIS/LDAP
non-sam users in future, we need to be careful.

Andrew Bartlett

-

..

mapping.c

Remove 'unixsam' from the default passdb backends.

-