[jdk8u-dev] RFR: 8293472: Incorrect container resource limit detection if manual cgroup fs mounts present [v2]

[Jonathan Dowland]

> This is a backport of 8293472 to 8u for cgroups v2 support. Not clean: log_debug→tty->print_cr and Files.writeString → Files.write() needed, as well as adjustments for the lack of [8266490](https://bugs.openjdk.org/browse/JDK-8266490) (PID controller support) in 8u.

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

  remove testJavaVersionWithCgMounts
  
  As Severin points out, this test is not useful (in its current form)
  for 8u.

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/216/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/216/files/5576837e..daae4588

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=216&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=216&range=00-01

  Stats: 14 lines in 1 file changed: 0 ins; 14 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/216.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/216/head:pull/216

PR: https://git.openjdk.org/jdk8u-dev/pull/216