RFR: 8374364: TestCgroupMetrics.java fails when cpuset unmounted [v6]

[SendaoYan]

> Hi all,
> 
> Test jdk/internal/platform/cgroup/TestCgroupMetrics.java report fails when the cpuset unmounted. The details shows in jbs issue. I think it's better to check the 'cpu period' or 'cpuset' available or not before run the releated tests.
> 
> Change has been verified locally. Test-fix only, no risk.

SendaoYan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:

 - Merge branch 'openjdk:master' into jbs8374364
 - Update comment "If cgroups is not configured, the test is skipped." which suggestion from @dholmes-ora
   
   Co-authored-by: David Holmes <62092539+dholmes-ora at users.noreply.github.com>
 - Update copyright year for test/lib/jdk/test/lib/containers/cgroup/MetricsTesterCgroupV1.java
 - Check cpu period and cpuset avaialable before test
 - Fix year
 - Move DockerTestUtils.checkCanTestDocker() inside MetricsTester
 - 8374364: TestCgroupMetrics.java fails when docker service unavailable

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28996/files
  - new: https://git.openjdk.org/jdk/pull/28996/files/8e2ee419..109302e5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28996&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28996&range=04-05

  Stats: 130803 lines in 3552 files changed: 62581 ins; 31208 del; 37014 mod
  Patch: https://git.openjdk.org/jdk/pull/28996.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28996/head:pull/28996

PR: https://git.openjdk.org/jdk/pull/28996