*: use SerialSuites to reduce the servers in tests at the same time

[HunDunDM]

Signed-off-by: HunDunDM hundundm@gmail.com

What problem does this PR solve?

close #4165

The watcher has been blocked. After troubleshooting its own problem, it is suspected that too many etcd have been started at the same time, causing the FD to run out.

What is changed and how it works?

*: use SerialSuites to reduce the servers in tests at the same time

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• lhy1024

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[codecov]

Codecov Report

Merging #4171 (1e40730) into master (7c76c98) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4171      +/-   ##
==========================================
+ Coverage   74.73%   74.76%   +0.02%     
==========================================
  Files         260      260              
  Lines       26481    26481              
==========================================
+ Hits        19791    19798       +7     
+ Misses       4917     4908       -9     
- Partials     1773     1775       +2     

Flag	Coverage Δ
unittests	74.76% <ø> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
pkg/etcdutil/etcdutil.go	82.35% <0.00%> (-5.89%)	⬇️
server/member/member.go	63.10% <0.00%> (-3.75%)	⬇️
server/tso/tso.go	64.20% <0.00%> (-2.85%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
server/schedule/operator/step.go	72.42% <0.00%> (-1.11%)	⬇️
server/grpc_service.go	46.93% <0.00%> (-0.23%)	⬇️
server/tso/local_allocator.go	71.62% <0.00%> (ø)
client/base_client.go	84.23% <0.00%> (+0.54%)	⬆️
server/server.go	72.15% <0.00%> (+0.74%)	⬆️
server/tso/allocator_manager.go	66.50% <0.00%> (+0.83%)	⬆️
... and 4 more

---

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[HunDunDM]

/merge

[ti-chi-bot]

@HunDunDM: 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: 1e40730

[HunDunDM]

Since the concurrency of the Suite is also 1 during the test, maybe the PR has no effect.