[crac] RFR: 8348925: [CRaC] Automatic CRaC support for LinuxWatchService

[Timofei Pushkin]

Updated version of the abandoned #71

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Commit messages:
 - Fix whitespace errors
 - Automatic CRaC support for LinuxWatchService

Changes: https://git.openjdk.org/crac/pull/195/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=195&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348925
  Stats: 421 lines in 3 files changed: 389 ins; 25 del; 7 mod
  Patch: https://git.openjdk.org/crac/pull/195.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/195/head:pull/195

PR: https://git.openjdk.org/crac/pull/195