[jdk17u-dev] RFR: 8342188: Update tests to use stronger key parameters and certificates

[Goetz Lindenmaier]

I backport this for parity with 17.0.14-oracle.

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Commit messages:
 - Backport ae82cc1ba101f6c566278f79a2e94bd1d1dd9efe

Changes: https://git.openjdk.org/jdk17u-dev/pull/3073/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3073&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342188
  Stats: 2728 lines in 15 files changed: 1090 ins; 395 del; 1243 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3073.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3073/head:pull/3073

PR: https://git.openjdk.org/jdk17u-dev/pull/3073