8287011: Improve container information

[jmtd]

Low-risk backport for Oracle parity. Improves diagnostic output for humans. Not quite clean: path shuffling; comment copyright line adjustments; context issues as jdk8u lacks the pid controller (JDK-8266490)

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Integration blockers

 ⚠️ Dependency #724 must be integrated first
 ⚠️ Failed to retrieve information on issue 8287011. Please make sure it exists and is accessible.

Issue

• ⚠️ Failed to retrieve information on issue 8287011.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev.git pull/725/head:pull/725
$ git checkout pull/725

Update a local copy of the PR:
$ git checkout pull/725
$ git pull https://git.openjdk.org/jdk8u-dev.git pull/725/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 725

View PR using the GUI difftool:
$ git pr show -t 725

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/725.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jdowland! A progress list of the required criteria for merging this PR into pr/724 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (72d46f63)