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

[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

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

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

Changes: https://git.openjdk.java.net/jdk/pull/384/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=384&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253727
  Stats: 33 lines in 3 files changed: 30 ins; 0 del; 3 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