RFR 8038079: Re-examine integration of SPNEGO authentication

[Pavel Rappo]

Hello,

Could you please review the following change for [1]?

    http://cr.openjdk.java.net/~prappo/8038079/webrev.00/

sun.net.www.protocol.http.HttpURLConnection defined in the java.base module uses
different authentication schemes. Among others there's a scheme called SPNEGO,
which is defined in a different module, java.security.jgss

Thanks,
-Pavel

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[1] https://bugs.openjdk.java.net/browse/JDK-8038079