RFR 8200152: KerberosString should use UTF-8 by default

[Weijun Wang]

Ping again.

> On Mar 23, 2018, at 11:04 AM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> Please take a review of the code change and CSR at
> 
>   CSR: https://bugs.openjdk.java.net/browse/JDK-8200153
>   webrev: http://cr.openjdk.java.net/~weijun/8200152/webrev.00/
> 
> Thanks
> Max
>