replication: check the up stores to switch to async

[nolouch]

What problem does this PR solve?

Fix #3924

start up one zone, and the another zone do not startup.

➜  pd git:(master) curl http://127.0.0.1:30058/pd/api/v1/replication_mode/status
{
  "mode": "dr-auto-sync",
  "dr-auto-sync": {
    "label_key": "",
    "state": "sync",
    "state_id": 4
  }
}

Check List

Tests

• Unit test

Release note

replication: fix the issue that the state cannot switch to async 

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rleungx

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[codecov]

Codecov Report

Merging #3991 (914da78) into master (ab0125b) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3991      +/-   ##
==========================================
+ Coverage   74.57%   74.80%   +0.22%     
==========================================
  Files         250      250              
  Lines       25541    25548       +7     
==========================================
+ Hits        19047    19110      +63     
+ Misses       4801     4761      -40     
+ Partials     1693     1677      -16     

Flag	Coverage Δ
unittests	74.80% <100.00%> (+0.22%)	⬆️

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

Impacted Files	Coverage Δ
server/replication/replication_mode.go	78.75% <100.00%> (+0.63%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
client/base_client.go	82.29% <0.00%> (-2.61%)	⬇️
server/schedule/operator/step.go	68.43% <0.00%> (-1.33%)	⬇️
server/schedule/operator_controller.go	84.75% <0.00%> (-0.80%)	⬇️
server/grpc_service.go	47.23% <0.00%> (ø)
client/client.go	71.82% <0.00%> (+0.27%)	⬆️
server/member/member.go	66.84% <0.00%> (+0.53%)	⬆️
server/server.go	72.64% <0.00%> (+0.75%)	⬆️
server/core/storage.go	68.44% <0.00%> (+0.76%)	⬆️
... and 11 more

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[nolouch]

PTAL @disksing @rleungx

[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: 15e0719

[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]

In response to a cherrypick label: new pull request created: #3995.