RFR: 8331231: containers/docker/TestContainerInfo.java fails

[Mikhailo Seledtsov]

Please review this simple change adding a cgroups keyword to container test that uses cgroups functionality.

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Commit messages:
 - 8331231: containers/docker/TestContainerInfo.java fails

Changes: https://git.openjdk.org/jdk/pull/19162/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19162&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331231
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19162.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19162/head:pull/19162

PR: https://git.openjdk.org/jdk/pull/19162