[jdk8u-dev] RFR: 8287011: Improve container information [v3]

[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 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 four additional commits since the last revision:

 - Merge remote-tracking branch 'remotes/jdk8u-dev/master' into 8287011-8u
 - 8287011: Improve container information
   
   Backport-of: e60939850e5328b9c0f2002ac5ed7744375bf18b
 - 8284758: [linux] improve print_container_info
   
   Reviewed-by: sgehwolf
   Backport-of: 6c6d5223dfaae268f968f4292356d4be89adb122
 - 8220658: Improve the readability of container information in the error log
   
   Backport-of: 2c4b9e0778e170a17b04217bee66bb6c4fb18c0c

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/725/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/725/files/72d46f63..51bfdfd4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=725&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=725&range=01-02

  Stats: 71830 lines in 445 files changed: 24449 ins; 15475 del; 31906 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