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

[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 incrementally with one additional commit since the last revision:

  Account for unlimited values in the test for memory.swap.max/memory.max

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/384/files
  - new: https://git.openjdk.java.net/jdk/pull/384/files/7dd62cfd..37a5979b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=384&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=384&range=00-01

  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 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