RFR: 8314330: java/foreign tests should respect vm flags when start new processes [v2]

[Leonid Mesnik]

> The test helper which spawn new jvms is updated to start them using VM flags for testing.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  fixed imports.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15302/files
  - new: https://git.openjdk.org/jdk/pull/15302/files/27f5eb83..23184fc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15302&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15302&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15302.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15302/head:pull/15302

PR: https://git.openjdk.org/jdk/pull/15302