[crac] RFR: 8369394: [CRaC] java.nio.channels.ClosedSelectorException in sun.nio.ch.SelectorImpl.ensureOpen

[Roman Marchenko]

Suppress `RuntimeException` as it can be thrown by `Selector.select()` method.

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Commit messages:
 - Suppress RuntimeException

Changes: https://git.openjdk.org/crac/pull/267/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=267&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369394
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/267.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/267/head:pull/267

PR: https://git.openjdk.org/crac/pull/267