auth4: avoid map_user_info() in auth_check_password_send()
The cracknames call is done in the "sam" backend now.
In order to support trusted domains correctly, the backends
need to get the raw values from the client.
This is the important change in order to no longer
silently map users from trusted domains to local users.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=2976
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12709
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>