RFR: 8290846: sun/tools/jstatd/JstatdTest* tests should use VM options

[Leonid Mesnik]

Propagate test.vm.opts/test.java.opts to tested process. Also, accept the output of non-generation (ZGC) GC as valid.

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Commit messages:
 - 8290846: sun/tools/jstatd/JstatdTest* tests should use VM options

Changes: https://git.openjdk.org/jdk/pull/9604/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290846
  Stats: 5 lines in 2 files changed: 1 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/9604.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9604/head:pull/9604

PR: https://git.openjdk.org/jdk/pull/9604