RFR: 8296612: CertAttrSet is useless [v2]

[Sean Mullan]

On Thu, 10 Nov 2022 20:51:40 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> - All `CertAttrSet` child classes now implement `DerEncoder`
>> - `DerEncoder::derEncode` is renamed to `DerEncoder::encode`, and duplicate methods are removed
>> - `s.s.x.Extension` now implements `DerEncoder`, so its child classes no need to implement it
>> - `X509CertImpl::encode(OutputStream out)` removed, used nowhere
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   overrides

Marked as reviewed by mullan (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11048