swagger: block swagger url if disbale swagger server (#6785)

[ti-chi-bot]

This is an automated cherry-pick of #6785

What problem does this PR solve?

Issue Number: Close #6786

What is changed and how does it work?

 /swagger/* return 404

Check List

Tests

• Manual test (add detailed scripts or steps below)
  Before
  curl xxxx:2379/swagger/ui/index

After
curl xxxx:2379/swagger/ui/index

swagger=1 make

Code changes

Side effects

Related changes

Release note

swagger: block swagger url if disbale swagger server

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bufferflies
• rleungx

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[codecov]

Codecov Report

Patch coverage: 40.00% and project coverage change: -0.06 ⚠️

Comparison is base (ffe7b9b) 74.97% compared to head (ef9bcdf) 74.92%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #6790      +/-   ##
===============================================
- Coverage        74.97%   74.92%   -0.06%     
===============================================
  Files              407      406       -1     
  Lines            40756    40754       -2     
===============================================
- Hits             30555    30533      -22     
- Misses            7537     7549      +12     
- Partials          2664     2672       +8     

Flag	Coverage Δ
unittests	74.92% <40.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
tests/cluster.go	78.57% <33.33%> (-0.50%)	⬇️
pkg/swaggerserver/swaggerserver_disable.go	50.00% <50.00%> (ø)

... and 37 files with indirect coverage changes

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[bufferflies]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: ef9bcdf