[jdk17u-dev] RFR: 8336012: Fix usages of jtreg-reserved properties

[Goetz Lindenmaier]

I backport this for parity with 17.0.15-oracle.

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Commit messages:
 - Backport e6c5aa7a6cb54c647d261facdcffa6a410849627

Changes: https://git.openjdk.org/jdk17u-dev/pull/3095/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3095&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336012
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3095.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3095/head:pull/3095

PR: https://git.openjdk.org/jdk17u-dev/pull/3095