Further work on NTLMSSP-based SMB signing. Current status is that I cannnot

Further work on NTLMSSP-based SMB signing.  Current status is that I cannnot
get Win2k to send a valid signiture in it's session setup reply - which it will
give to win2k clients.

So, I need to look at becoming 'more like MS', but for now I'll get this code
into the tree.  It's actually based on the TNG cli_pipe_ntlmssp.c, as it was
slightly easier to understand than our own (but only the utility functions
remain in any way intact...).

This includes the mysical 'NTLM2' code - I have no idea if it actually works.

(I couldn't get TNG to use it for its pipes either).

Andrew Bartlett
(This used to be commit a034a5e381ba5612be21e2ba640d11f82cd945da)