fix cannot prune/scale-in tikv when use ipv6

[nexustar]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• kaaaaaaang

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[codecov-commenter]

Codecov Report

Patch coverage: 82.14% and project coverage change: -0.05 ⚠️

Comparison is base (8fe14ca) 56.24% compared to head (aa8c894) 56.19%.

❗ Current head aa8c894 differs from pull request most recent head c2cfc0e. Consider uploading reports for the commit c2cfc0e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2180      +/-   ##
==========================================
- Coverage   56.24%   56.19%   -0.05%     
==========================================
  Files         318      318              
  Lines       33452    33460       +8     
==========================================
- Hits        18812    18800      -12     
- Misses      12399    12420      +21     
+ Partials     2241     2240       -1     

Flag	Coverage Δ
cluster	45.02% <82.14%> (-0.05%)	⬇️
dm	26.04% <3.57%> (-0.03%)	⬇️
playground	15.46% <0.00%> (-0.02%)	⬇️
tiup	16.03% <0.00%> (+0.02%)	⬆️
unittest	22.77% <13.33%> (-<0.01%)	⬇️

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

Impacted Files	Coverage Δ
pkg/cluster/spec/pump.go	62.72% <0.00%> (-4.14%)	⬇️
pkg/cluster/spec/drainer.go	56.14% <50.00%> (ø)
pkg/cluster/operation/destroy.go	59.54% <60.00%> (-0.63%)	⬇️
pkg/cluster/operation/scale_in.go	49.53% <85.71%> (-3.45%)	⬇️
pkg/cluster/api/pdapi.go	52.11% <100.00%> (+0.08%)	⬆️
pkg/cluster/operation/upgrade.go	47.14% <100.00%> (ø)
pkg/cluster/spec/validate.go	92.61% <100.00%> (+0.01%)	⬆️
pkg/utils/utils.go	82.93% <100.00%> (+2.93%)	⬆️

... and 5 files with indirect coverage changes

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[kaaaaaaang]

/merge

[ti-chi-bot]

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

Commit hash: c2cfc0e