RFR 8186831: Kerberos ignores PA-DATA with a non-null s2kparams

[Xuelei Fan]

Looks fine to me.  

A minor comment about the method name "isNew", i'm not very sure what does it means.  I would add comments about what the "new" refers to.

Xuelei

> On Aug 28, 2017, at 11:12 PM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> Please review the fix at
> 
>   http://cr.openjdk.java.net/~weijun/8186831/webrev.00/
> 
> This is an old bug that is about to bite us soon.
> 
> Thanks
> Max
>