[jdk11u-dev] RFR: 8293819: sun/util/logging/PlatformLoggerTest.java failed with "RuntimeException: Retrieved backing PlatformLogger level null is not the expected CONFIG"

[Amos Shi]

Backport of [JDK-8293819](https://bugs.openjdk.org/browse/JDK-8293819)
- Clean Backport
- Test Succeeded in local Dev Apple M1 Laptop

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Commit messages:
 - Backport 11e7d53b23796cbd3d878048f7553885ae07f4d1

Changes: https://git.openjdk.org/jdk11u-dev/pull/2362/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293819
  Stats: 10 lines in 1 file changed: 5 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2362.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2362/head:pull/2362

PR: https://git.openjdk.org/jdk11u-dev/pull/2362