log: remove useless log

[nolouch]

Signed-off-by: nolouch [email protected]

What problem does this PR solve?

close #4531.
There are some logger exist in PD: capnslog, logrus,zap and so on.

after #1452. etcd supports customize the logger, so we can remove the redundant loggers that remaining for compatibility purpose.

What is changed and how it works?

remove useless code

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• JmPotato

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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

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[ti-chi-bot]

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

Commit hash: 319778d

[HunDunDM]

/run-unit-test

[HunDunDM]

/run-unit-test

[codecov]

Codecov Report

Merging #4532 (319778d) into master (27d7f63) will increase coverage by 0.20%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4532      +/-   ##
==========================================
+ Coverage   74.75%   74.96%   +0.20%     
==========================================
  Files         265      265              
  Lines       27945    27844     -101     
==========================================
- Hits        20891    20873      -18     
+ Misses       5191     5111      -80     
+ Partials     1863     1860       -3     

Flag	Coverage Δ
unittests	74.96% <0.00%> (+0.20%)	⬆️

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

Impacted Files	Coverage Δ
pkg/logutil/log.go	83.33% <0.00%> (+33.71%)	⬆️
server/api/region.go	67.86% <ø> (ø)
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/region_syncer/server.go	81.41% <0.00%> (-5.13%)	⬇️
server/id/id.go	80.95% <0.00%> (-4.77%)	⬇️
server/member/member.go	63.10% <0.00%> (-3.75%)	⬇️
server/schedule/checker/rule_checker.go	78.97% <0.00%> (-1.03%)	⬇️
server/schedule/operator_controller.go	83.91% <0.00%> (-0.82%)	⬇️
server/encryptionkm/key_manager.go	72.90% <0.00%> (-0.80%)	⬇️
server/schedule/operator/step.go	74.02% <0.00%> (-0.72%)	⬇️
... and 9 more

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