[crac] RFR: Terminate restored process when criuengine restorewait exits

[Radim Vansa]

With criuengine the restored process gets restorewait process as its parent; scripts not expecting two processes might signal (e.g. terminate) the parent process but the actual restored process would get orphaned.

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Commit messages:
 - Terminate restored process when criuengine restorewait exits

Changes: https://git.openjdk.org/crac/pull/131/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=131&range=00
  Stats: 147 lines in 5 files changed: 147 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/131.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/131/head:pull/131

PR: https://git.openjdk.org/crac/pull/131