RFR: 8262953: [TESTBUG] Test /runtime/containers/cgroup/PlainRead.java fails if CPU quoata is not enabled

[Anton Ostrouhhov]

Hello!
Both _CPU Quota_ and _CPU Period_ are missing from output if kernel was built without `CONFIG_CFS_BANDWIDTH`.

This is my first contribution so please tell me if i am wrong somewhere.

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Commit messages:
 - 8262953: [TESTBUG] Test /runtime/containers/cgroup/PlainRead.java fails if CPU quoata is not enabled

Changes: https://git.openjdk.java.net/jdk/pull/3206/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3206&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262953
  Stats: 14 lines in 1 file changed: 13 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3206.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3206/head:pull/3206

PR: https://git.openjdk.java.net/jdk/pull/3206