config: fix the display value of the log level

[nolouch]

Signed-off-by: nolouch [email protected]

What problem does this PR solve?

close #4518

What is changed and how it works?

assign default value

Check List

Tests

• Unit test
• Integration test
  

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• bufferflies

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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: 2f8f947

[nolouch]

/run-unit-tests

[codecov]

Codecov Report

Merging #4519 (2f8f947) into master (35a02c6) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4519      +/-   ##
==========================================
+ Coverage   74.80%   74.83%   +0.03%     
==========================================
  Files         264      264              
  Lines       27933    27933              
==========================================
+ Hits        20896    20905       +9     
+ Misses       5164     5157       -7     
+ Partials     1873     1871       -2     

Flag	Coverage Δ
unittests	74.83% <100.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
server/config/config.go	77.89% <100.00%> (ø)
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
server/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
server/region_syncer/client.go	79.68% <0.00%> (-3.91%)	⬇️
server/member/member.go	63.10% <0.00%> (-1.61%)	⬇️
server/config/persist_options.go	91.66% <0.00%> (-0.76%)	⬇️
server/tso/allocator_manager.go	64.89% <0.00%> (-0.50%)	⬇️
server/server.go	72.23% <0.00%> (+0.29%)	⬆️
server/grpc_service.go	52.17% <0.00%> (+0.38%)	⬆️
... and 6 more

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