This patch adds the handling of basic NTLM commands. Because there's some mysterious
4 zero bytes after pickle header in Kerberos packets, not present in NTLM commands, the
patch also had to rework a bit the packet parsing / forging.
The patch also addresses a server-side bug when parsing supplemental creds, if the client
was sending an empty list, we were considering this as an error.
And finally we also implement the parsing of MSV1_0_REMOTE_SUPPLEMENTAL_CREDENTIAL.
This breaks the public API, anyway this was basically unused (as not parsed before) and
the previous API was wrong as what we receive is MSV1_0_REMOTE_SUPPLEMENTAL_CREDENTIAL
not MSV1_0_SUPPLEMENTAL_CREDENTIAL, so I guess the API breakage is ok.
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