[jdk8u-dev] RFR: 8222299: [TESTBUG] move hotspot container tests to hotspot/containers [v6]

[yaqsun]

> This is a backport of JDK-8222299: [TESTBUG] move hotspot container tests to hotspot/container.
> 
> This patch has already been applied to OracleJDK8.
> 
> This backport has resolved the conflict about hotspot/test/TEST.groups. doc/testing.html and doc/testing.md do not exist in 8u.

yaqsun 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 backport-8222299
 - update test/lib/jdk/test/lib/containers/docker/DockerTestUtils.java
 - Merge branch 'openjdk:master' into backport-8222299
 - Backport 66c817134fa012d53128eecfc1bac0c32c678145
 - Merge branch 'openjdk:master' into backport-8222299
 - Backport 66c817134fa012d53128eecfc1bac0c32c678145
 - Backport 66c817134fa012d53128eecfc1bac0c32c678145

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/488/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/488/files/c85f8cd1..df7831f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=488&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=488&range=04-05

  Stats: 34482 lines in 211 files changed: 6531 ins; 26836 del; 1115 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/488.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/488/head:pull/488

PR: https://git.openjdk.org/jdk8u-dev/pull/488