RFR: 8303809: Dispose context in SPNEGO NegotiatorImpl

[Weijun Wang]

On Wed, 8 Mar 2023 09:05:19 GMT, Alexey Bakhtin <abakhtin at openjdk.org> wrote:

> This patch fixes a possible native memory leak in case of a custom native GSS provider.
> The actual leak was reported in production.
> 
> sun/security/jgss, sun/security/krb5, sun/net/www/protocol/http jtreg tests are passed

Maybe it's because it can be added into a cache or stored in `currentServerCredentials`? But then Daniel F asks if it can  remain valid.

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PR: https://git.openjdk.org/jdk/pull/12920