RFR: 8232066: Remove outdated code/methods from PKIX implementation [v2]

[Sean Mullan]

On Thu, 29 Jul 2021 15:09:14 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> Looks good. One nit: `Validator::getInstance` methods are internal. Does it really matter to check for null?

Good point. Also, NPE will be thrown later when an `EndEntityChecker` is invoked and it needs to determine the variant to use. However, I had to change the `ConstructorTest` test not to test for this case anymore.

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PR: https://git.openjdk.java.net/jdk/pull/4934