[jdk8u-dev] RFR: 8287011: Improve container information [v4]

[Jonathan Dowland]

> 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)

Jonathan Dowland has updated the pull request incrementally with one additional commit since the last revision:

  delete print_container_helper
  
  This was removed in the original commit we are backporting but was
  re-introduced in error when resolving subsequent merge conflicts.

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/725/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/725/files/51bfdfd4..f732fc1c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=725&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=725&range=02-03

  Stats: 13 lines in 1 file changed: 0 ins; 13 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/725.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/725/head:pull/725

PR: https://git.openjdk.org/jdk8u-dev/pull/725