utils: use `keyutil` pkg to simply the code

[bufferflies]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot[bot]]

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Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456, multiple issues should use full syntax for each issue and be separated by a comma, like: Issue Number: close #123, ref #456.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.55556% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.02%. Comparing base (99742e9) to head (846c19c). Report is 1090 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/statistics/buckets/hot_bucket_cache.go	92.30%	0 Missing and 1 partial :warning:
pkg/utils/keyutil/util.go	93.75%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6443      +/-   ##
==========================================
- Coverage   75.20%   75.02%   -0.19%     
==========================================
  Files         408      409       +1     
  Lines       41120    41493     +373     
==========================================
+ Hits        30926    31131     +205     
- Misses       7515     7654     +139     
- Partials     2679     2708      +29     

Flag	Coverage Δ
unittests	75.02% <95.55%> (-0.19%)	:arrow_down:

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[ti-chi-bot[bot]]

PR needs rebase.

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[bufferflies]

/close

[ti-chi-bot[bot]]

@bufferflies: Closed this PR.

In response to this:

/close

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