[jdk21u-dev] RFR: 8319651: Several network tests ignore vm flags when start java process

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 9538f5d317972bbb82f7f2575819d35d2a5f8b91

Changes: https://git.openjdk.org/jdk21u-dev/pull/400/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=400&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319651
  Stats: 123 lines in 14 files changed: 27 ins; 35 del; 61 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/400.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/400/head:pull/400

PR: https://git.openjdk.org/jdk21u-dev/pull/400