Support for SPNEGO mechansim in Java GSS ( Mustang feature 263 ).

Java GSS is a framework that can support multiple security mechanisms;
a way to negotiate a security mechanism underneath GSS-API is needed.
We need to implement SPNEGO (Simple and Protected GSS-API Negotiation
Mechanism) to provide this feature, as specified by IETF in RFC 2478.

SPNEGO is a pseudo GSS security mechanism to enable a client and server
to securely negotiate a common GSS security mechanism to be used.

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