pkg: fix read cpu quota from cgroup v2

[rleungx]

What problem does this PR solve?

Issue Number: Close #6262.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

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• JmPotato

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[codecov]

Codecov Report

Patch coverage: 71.79% and project coverage change: +0.14 🎉

Comparison is base (ab0dbdc) 74.96% compared to head (1c32cd3) 75.11%.

❗ Current head 1c32cd3 differs from pull request most recent head 6537eea. Consider uploading reports for the commit 6537eea to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6296      +/-   ##
==========================================
+ Coverage   74.96%   75.11%   +0.14%     
==========================================
  Files         404      404              
  Lines       39736    39748      +12     
==========================================
+ Hits        29789    29855      +66     
+ Misses       7319     7279      -40     
+ Partials     2628     2614      -14     

Flag	Coverage Δ
unittests	75.11% <71.79%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cgroup/cgroup_memory.go	76.08% <50.00%> (-10.93%)	⬇️
pkg/cgroup/cgroup_cpu.go	76.08% <85.18%> (-2.04%)	⬇️
pkg/cgroup/cgroup.go	71.42% <100.00%> (+1.69%)	⬆️

... and 43 files with indirect coverage changes

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[JmPotato]

LGTM. Any real-environment test?

[rleungx]

LGTM. Any real-environment test?

For now, we only have a unit test, which failed before. After this PR, it passes.

[rleungx]

/cc @hawkingrei

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[rleungx]

/merge

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This pull request has been accepted and is ready to merge.

Commit hash: 1c32cd3

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