RFR: 8374364: TestCgroupMetrics.java fails when docker service unavailable [v2]

[SendaoYan]

> Hi all,
> 
> Test jdk/internal/platform/cgroup/TestCgroupMetrics.java report fails when the docker service is unavailable. The details shows in jbs issue. I think it's better to call `DockerTestUtils.checkCanTestDocker()` before run this test.
> 
> Change has been verified locally. Test-fix only, no risk.

SendaoYan has updated the pull request incrementally with two additional commits since the last revision:

 - Fix year
 - Move DockerTestUtils.checkCanTestDocker() inside MetricsTester

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28996/files
  - new: https://git.openjdk.org/jdk/pull/28996/files/9411a6e7..fe094b55

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28996&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28996&range=00-01

  Stats: 6 lines in 2 files changed: 2 ins; 2 del; 2 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