r6464: Remove the last of the Samba3 NTLMSSP API. This removes the rudundent

r6464: Remove the last of the Samba3 NTLMSSP API.  This removes the rudundent
struct ntlmssp_state, and pushes all the member elements into struct
gensec_ntlmssp_state.

This also removes the 2-layer start function, caused by the previous
double abstraction layer.

Andrew Bartlett
(This used to be commit eebbb4205b335214d24974f3be825846f6227f0c)