tikv_util: handle cgroup path building error (#12485)

[ti-srebot]

cherry-pick #12485 to release-5.2
You can switch your code base to this Pull Request by using git-extras:

# In tikv repo:
git pr https://github.com/tikv/tikv/pull/12630

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tikv.git pr/12630:release-5.2-456075a28d9b

---

Signed-off-by: tabokie [email protected]

What is changed and how it works?

Issue Number: Close #12479, #12585

What's Changed:

Handle cgroup path building error gracefully

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hunterlxt
• tabokie

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[ti-srebot]

/run-all-tests

[ti-srebot]

@tabokie you're already a collaborator in bot's repo.

[ti-chi-bot]

This pull request is closed because its related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

https://prow.tidb.net/command-help#cherrypick
https://book.prow.tidb.net/#/plugins/cherrypicker