*: fix data race when starting server

[rleungx]

What problem does this PR solve?

Issue Number: Close #7419.

What is changed and how does it work?

Because etcd is started first, before the server is started, the incoming request may cause a data race since the member is not initialized.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• lhy1024

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[codecov]

Codecov Report

Merging #7420 (ca42385) into master (c0dad35) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head ca42385 differs from pull request most recent head 45cefa7. Consider uploading reports for the commit 45cefa7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7420      +/-   ##
==========================================
+ Coverage   74.25%   74.31%   +0.05%     
==========================================
  Files         451      451              
  Lines       49386    49385       -1     
==========================================
+ Hits        36671    36699      +28     
+ Misses       9453     9426      -27     
+ Partials     3262     3260       -2     

Flag	Coverage Δ
unittests	74.31% <100.00%> (+0.05%)	⬆️

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

[rleungx]

/check-issue-triage-complete

[rleungx]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

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

Commit hash: ca42385

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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