cdc: retry on resign the owner, if old owner in power again.

[3AceShowHand]

What problem does this PR solve?

What is changed and how it works?

retry on owner resign, to make it more robust.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

Side effects

Related changes

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• nexustar

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[codecov-commenter]

Codecov Report

Base: 44.99% // Head: 48.36% // Increases project coverage by +3.37% 🎉

Coverage data is based on head (204dee6) compared to base (3671d82).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 204dee6 differs from pull request most recent head 37f7736. Consider uploading reports for the commit 37f7736 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2036      +/-   ##
==========================================
+ Coverage   44.99%   48.36%   +3.37%     
==========================================
  Files         309      309              
  Lines       36034    36042       +8     
==========================================
+ Hits        16212    17431    +1219     
+ Misses      17871    16549    -1322     
- Partials     1951     2062     +111     

Flag	Coverage Δ
cluster	34.98% <0.00%> (+6.12%)	⬆️
dm	24.05% <0.00%> (-0.05%)	⬇️
playground	13.29% <0.00%> (+0.07%)	⬆️
tiup	14.24% <0.00%> (-0.01%)	⬇️
unittest	20.76% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
pkg/cluster/api/cdcapi.go	42.86% <0.00%> (+42.86%)	⬆️
pkg/cluster/spec/cdc.go	55.88% <0.00%> (+19.41%)	⬆️
pkg/cluster/api/dmapi.go	59.88% <0.00%> (-1.74%)	⬇️
components/playground/main.go	49.31% <0.00%> (+0.20%)	⬆️
pkg/cluster/spec/grafana.go	64.76% <0.00%> (+0.95%)	⬆️
components/playground/playground.go	51.65% <0.00%> (+0.99%)	⬆️
pkg/cluster/executor/ssh.go	62.27% <0.00%> (+1.10%)	⬆️
pkg/utils/ioutil.go	49.81% <0.00%> (+1.17%)	⬆️
pkg/cluster/manager/display.go	45.63% <0.00%> (+1.22%)	⬆️
pkg/cluster/manager/upgrade.go	60.00% <0.00%> (+1.62%)	⬆️
... and 47 more

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[nexustar]

/merge

[ti-chi-bot]

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

Commit hash: 37f7736