server: make leader can lost lease as soon as possible (#3712)

[ti-chi-bot]

This is an automated cherry-pick of #3712

Signed-off-by: nolouch nolouch@gmail.com

What problem does this PR solve?

Fix #3697
When the store's number is 180. we resign pd leader may need one minute or more to finish elect the new leader:

details replay: https://gist.github.com/disksing/a1bf78007b674da7e15b52a9e25eb3a5

What is changed and how it works?

make leader can be lost lease as soon as possible

Check List

Tests

• Integration test

Release note

Fix the issue that leader re-election be slow when there are many stores

[codecov]

Codecov Report

Merging #3719 (b67427a) into release-5.0 (8a2cfe9) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.0    #3719      +/-   ##
===============================================
- Coverage        74.60%   74.54%   -0.06%     
===============================================
  Files              245      245              
  Lines            24140    24149       +9     
===============================================
- Hits             18010    18003       -7     
- Misses            4513     4523      +10     
- Partials          1617     1623       +6     

Flag	Coverage Δ
unittests	74.54% <100.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.95% <100.00%> (+0.02%)	⬆️
server/server.go	72.93% <100.00%> (+0.02%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
server/region_syncer/server.go	83.33% <0.00%> (-6.07%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/schedule/operator/step.go	67.44% <0.00%> (-1.67%)	⬇️
tools/pd-ctl/pdctl/command/operator.go	65.99% <0.00%> (-1.22%)	⬇️
server/handler.go	41.97% <0.00%> (-0.50%)	⬇️
server/grpc_service.go	46.94% <0.00%> (-0.23%)	⬇️
... and 4 more

---

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[nolouch]

PTAL @rleungx @JmPotato

[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

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

@nolouch: /merge in this pull request requires 2 /lgtm.

In response to this:

/merge

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• nolouch

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[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

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

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

Commit hash: d83603e