RFR: 8353738: Update TLS unit tests to not use certificates with MD5 signatures [v3]

[Artur Barashev]

On Wed, 29 Oct 2025 11:57:45 GMT, Matthew Donovan <mdonovan at openjdk.org> wrote:

>> This PR updates tests that were using MD5 certificates. For most of the tests, I added test cases for TLSv1.2/MD5withRSA and TLSv1.3/SHA256withRSA.
>
> Matthew Donovan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   changed tests to use SecurityUtils.removeDisabled*Algs methods

test/jdk/sun/net/www/protocol/https/HttpsURLConnection/IdentitiesBase.java line 184:

> 182:         SSLContext ctx = SSLContext.getInstance(protocol);
> 183: 
> 184:         if (keyCert != null) {

Why do we check for keyCert being `null`? Do we expect some future tests to make use of it? BTW, in such case `CertificateBuilder.printCertificate` would fail first.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27342#discussion_r2479633177