8284758: [linux] improve print_container_info

[jmtd]

Low-risk, for Oracle parity. Mostly a clean-up. This will ease the future backporting of JDK-8287011.

Doesn't apply clean: needs adjusting for paths and also context, to reflect 8u's lack of 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
• JDK-8284758 needs maintainer approval

Integration blocker

 ⚠️ Dependency #723 must be integrated first

Issue

• JDK-8284758: [linux] improve print_container_info (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev.git pull/724/head:pull/724
$ git checkout pull/724

Update a local copy of the PR:
$ git checkout pull/724
$ git pull https://git.openjdk.org/jdk8u-dev.git pull/724/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 724

View PR using the GUI difftool:
$ git pr show -t 724

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/724.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jdowland! A progress list of the required criteria for merging this PR into pr/723 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 (fdb4a87d)