RFR 8072996: Deprecate stream-based GSSContext methods

[Weijun Wang]

Please also review the release note at https://bugs.openjdk.java.net/browse/JDK-8203846.

Thanks.

> On May 25, 2018, at 8:27 AM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> CSR and webrev updated.
> 
>   webrev: http://cr.openjdk.java.net/~weijun/8072996/webrev.01/
>      CSR: https://bugs.openjdk.java.net/browse/JDK-8202953
> 
> Thanks
> Max