[jdk17u-dev] RFR: 8317039: Enable specifying the JDK used to run jtreg

[Goetz Lindenmaier]

I backport this for parity with 17.0.11-oracle.

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Commit messages:
 - Backport 2545f55e509fdc3a2fa6e4dec33f1b4a20a8b679

Changes: https://git.openjdk.org/jdk17u-dev/pull/2141/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2141&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317039
  Stats: 44 lines in 5 files changed: 42 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2141.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2141/head:pull/2141

PR: https://git.openjdk.org/jdk17u-dev/pull/2141