RFR 8215032: Support Kerberos cross-realm referrals (RFC 6806)

[Martin Balao]

Hi,

I'd like to propose Webrev.02:

 * http://cr.openjdk.java.net/~mbalao/webrevs/8215032/8215032.webrev.02/

Security properties were introduced mirroring System properties. See CSR
[1].

Thanks,
Martin.-

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[1] - https://bugs.openjdk.java.net/browse/JDK-8223172