RFR 8250582: Revert Principal Name type to NT-UNKNOWN when requesting TGS Kerberos tickets

[Martin Balao]

Hello Max,

I'd like to propose a patch for "8250582: Revert Principal Name type to
NT-UNKNOWN when requesting TGS Kerberos tickets" [1].

Webrev.00:

 * http://cr.openjdk.java.net/~mbalao/webrevs/8250582/8250582.webrev.00/

This change is trivial and we are reverting to a previous (and known
state). I've run tests under sun/security/krb5 and did not find any
regression (125 passed). I've also run my internal Kerberos-referrals
test -based on a real Active Directory environment- and worked fine.

Thanks,
Martin.-

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[1] - https://bugs.openjdk.java.net/browse/JDK-8250582