[jdk21u-dev] RFR: 8321163: [test] OutputAnalyzer.getExitValue() unnecessarily logs even when process has already completed

[Goetz Lindenmaier]

I backport this to streamline testing.

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Commit messages:
 - Backport 672f37324f9f15ae3e03b9b3b86c7106e6a09eed

Changes: https://git.openjdk.org/jdk21u-dev/pull/458/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=458&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321163
  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/458.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/458/head:pull/458

PR: https://git.openjdk.org/jdk21u-dev/pull/458