RFR: 8253727: [cgroups v2] Memory and swap limits reported incorrectly [v3]

[Severin Gehwolf]

> Account for interface files for swap and memory being reported independently.
> The cgroup v1-like value is now reported by adding the memory.max value to
> the memory.swap.max value.
> 
> Testing: Container tests on Linux x86_64 on cgroups v2 with crun 0.15

Severin Gehwolf 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 one additional commit since
the last revision:

  8253727: [cgroups v2] Memory and swap limits reported incorrectly

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/384/files
  - new: https://git.openjdk.java.net/jdk/pull/384/files/37a5979b..380cd49e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=384&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=384&range=01-02

  Stats: 2342 lines in 104 files changed: 1251 ins; 577 del; 514 mod
  Patch: https://git.openjdk.java.net/jdk/pull/384.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/384/head:pull/384

PR: https://git.openjdk.java.net/jdk/pull/384