global config: fix etcd client not found (#6866)

[ti-chi-bot]

This is an automated cherry-pick of #6866

What problem does this PR solve?

Issue Number: Close #6860,#6858

What is changed and how does it work?

Check List

Tests

• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[lhy1024]

Do we need to pick it to other branches?

[HuSharp]

yes, due to this pr, seems like we need to change a lot...
https://github.com/tikv/pd/pull/4308/files#diff-eb404b45d0a569b05f58f4e4bf2b42b32150be75ec2ed72f86330c4b5d739eab

[codecov]

Codecov Report

Patch coverage: 89.32% and project coverage change: +0.02% 🎉

Comparison is base (f8bf1d7) 74.96% compared to head (ea212a7) 74.98%.
Report is 3 commits behind head on release-7.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #6935      +/-   ##
===============================================
+ Coverage        74.96%   74.98%   +0.02%     
===============================================
  Files              406      406              
  Lines            40755    40820      +65     
===============================================
+ Hits             30551    30608      +57     
- Misses            7539     7541       +2     
- Partials          2665     2671       +6     

Flag	Coverage Δ
unittests	74.98% <89.32%> (+0.02%)	⬆️

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

Files Changed	Coverage Δ
client/errs/errno.go	100.00% <ø> (ø)
client/resource_group/controller/config.go	87.50% <ø> (ø)
client/resource_group/controller/limiter.go	72.06% <ø> (ø)
client/resource_group/controller/testutil.go	100.00% <ø> (ø)
pkg/schedule/placement/fit.go	94.94% <0.00%> (-1.08%)	⬇️
pkg/schedule/operator/create_operator.go	91.07% <72.72%> (-0.71%)	⬇️
pkg/schedule/checker/rule_checker.go	83.00% <76.92%> (-0.69%)	⬇️
client/resource_group/controller/controller.go	74.32% <100.00%> (+0.67%)	⬆️
pkg/schedule/operator/builder.go	86.68% <100.00%> (+0.08%)	⬆️
pkg/schedule/operator/operator.go	92.85% <100.00%> (ø)
... and 5 more

... and 30 files with indirect coverage changes

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[nolouch]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: ea212a7