[jdk11u-dev] RFR: 8199874: [TESTBUG] runtime/Thread/ThreadPriorities.java fails with "expected 0 to equal 10"

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

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Commit messages:
 - Backport 0d9f615e9214ed6f1f69f6e7969e966005948eb3

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/898/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=898&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8199874
  Stats: 18 lines in 1 file changed: 13 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/898.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/898/head:pull/898

PR: https://git.openjdk.java.net/jdk11u-dev/pull/898