cluster: speed scheduler exit (#4148)

[ti-chi-bot]

This is an automated cherry-pick of #4148

What problem does this PR solve?

closed #4146 speed schedule exit

What is changed and how it works?

pause scheduler after accept stop signal, and do not loop

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

speed scheduler exit  

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[codecov]

Codecov Report

Merging #4198 (d0e3f61) into release-5.1 (6b186ae) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.1    #4198      +/-   ##
===============================================
+ Coverage        75.14%   75.33%   +0.19%     
===============================================
  Files              245      245              
  Lines            24682    24686       +4     
===============================================
+ Hits             18547    18597      +50     
+ Misses            4511     4478      -33     
+ Partials          1624     1611      -13     

Flag	Coverage Δ
unittests	75.33% <100.00%> (+0.19%)	⬆️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.39% <100.00%> (-0.13%)	⬇️
server/cluster/coordinator.go	73.57% <100.00%> (+0.25%)	⬆️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
server/election/leadership.go	83.52% <0.00%> (-3.53%)	⬇️
server/core/storage.go	67.68% <0.00%> (-1.53%)	⬇️
pkg/tempurl/tempurl.go	60.00% <0.00%> (ø)
client/client.go	71.96% <0.00%> (+0.13%)	⬆️
server/grpc_service.go	48.11% <0.00%> (+0.34%)	⬆️
server/server.go	72.49% <0.00%> (+0.45%)	⬆️
... and 10 more

---

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[bufferflies]

lgtm

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 6db04e8

[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Please provide the associated issue number in the commit messages, for example: close #12345, or ref #12345.

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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