(merge from 3.0)

(merge from 3.0)

Move our basic password checking code from inside the authentication
subsystem into a seperate file - ntlm_check.c.

This allows us to call these routines from ntlm_auth.  The purpose of this
exercise is to allow ntlm_auth (when operating as an NTLMSSP server) to
avoid talking to winbind.  This should allow for easier debugging.

ntlm_auth itself has been reorgainised, so as to share more code between
the SPNEGO-wrapped and 'raw' NTLMSSP modes.  A new 'client' NTLMSSP mode
has been added, for use with a Cyrus-SASL module I am writing (based on vl's
work)

Andrew Bartlett