[jdk17u-dev] RFR: 8312049: runtime/logging/ClassLoadUnloadTest can be improved

[Daniel Hu]

Backporting test

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Commit messages:
 - Backport 4676b40f17dd18941f5883cb9b989ad639992a50

Changes: https://git.openjdk.org/jdk17u-dev/pull/2806/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2806&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312049
  Stats: 34 lines in 1 file changed: 3 ins; 6 del; 25 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2806.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2806/head:pull/2806

PR: https://git.openjdk.org/jdk17u-dev/pull/2806