RFR: CODETOOLS-7902917: jcstress: Errors during interruption tests

[Aleksey Shipilev]

This is a regression since CODETOOLS-7902906. The interruption tests would never reply the result, because they call System.exit(0) before binary link is able to push the result.

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Commit messages:
 - Fix interrupt tests

Changes: https://git.openjdk.java.net/jcstress/pull/45/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=45&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902917
  Stats: 19 lines in 3 files changed: 16 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/45.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/45/head:pull/45

PR: https://git.openjdk.java.net/jcstress/pull/45