[jdk8u-dev] RFR: 8284758: [linux] improve print_container_info [v2]

[Jonathan Dowland]

> 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]).
> 
> [JDK-8287011]: https://bugs.openjdk.org/browse/JDK-8287011 (forthcoming)
> [JDK-8287011]: https://bugs.openjdk.org/browse/JDK-8266490 (not considered)

Jonathan Dowland 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.

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/724/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/724/files/fdb4a87d..fdb4a87d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=724&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=724&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/724.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/724/head:pull/724

PR: https://git.openjdk.org/jdk8u-dev/pull/724