[patch]Add DER decoding of ASN.1 structure negTokenResp of SPNEGO

[Shirish Pargaonkar]

This patch adds DER decoding of ASN.1 structure negTokenResp of SPNEGO.

Currently, only security mechanism used/handled in CIFS using SPNEGO
is Kerberos,
so use the function decode_negTokenResp to check the response to
negTokenInit sent by Kerberos.
I am not sure in case of Kerberos, what follows in the negTokenResp i.e.
how does kerberos blob look like if the negstate is accept-incomplete,
so I let it go further
instead of returning from decode_negTokenResp but at some point we will need a
function to handle that blob.


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