[crac] RFR: C++ize criuengine

[Jan Kratochvil]

As the #97 review has no good solution I have C++ized the `criuengine` first.

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Commit messages:
 - C++ize criuengine

Changes: https://git.openjdk.org/crac/pull/98/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=98&range=00
  Stats: 845 lines in 3 files changed: 414 ins; 429 del; 2 mod
  Patch: https://git.openjdk.org/crac/pull/98.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/98/head:pull/98

PR: https://git.openjdk.org/crac/pull/98