[jdk21u-dev] RFR: 8333857: Test sun/security/ssl/SSLSessionImpl/ResumeChecksServer.java failed: Existing session was used

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

Needed to resolve and adapt larger parts of ResumeChecksServer.java as https://bugs.openjdk.org/browse/JDK-8357033 is not in 21.

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Commit messages:
 - Adapt to Java 21
 - backport e6ebefaa404daa4160bdc1c5d9c954c040e2c0c2

Changes: https://git.openjdk.org/jdk21u-dev/pull/2494/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2494&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333857
  Stats: 384 lines in 2 files changed: 106 ins; 138 del; 140 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2494.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2494/head:pull/2494

PR: https://git.openjdk.org/jdk21u-dev/pull/2494