[jdk11u-dev] RFR: 8317039: Enable specifying the JDK used to run jtreg

[Matthias Baesken]

8317039: Enable specifying the JDK used to run jtreg

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Commit messages:
 - Backport b186446511655b317e05c79aeb3cdd324e254cdc

Changes: https://git.openjdk.org/jdk11u-dev/pull/2831/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2831&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/jdk11u-dev/pull/2831.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2831/head:pull/2831

PR: https://git.openjdk.org/jdk11u-dev/pull/2831