(WIP)Debug azure custom-dns issue

[jianping-shu]

Testing HIVE-2706 feature and userProvisionedDNS in install-config didn't take effect.
In debugging, login on provision pod:
check the /installconfig/install-config.yaml, ok
mkdir an new folder
copy /installconfig/install-config.yaml to the new folder(And update pullSecret)
Run ./openshift-install create manifests --dir
Check cluster-api/02_azure-cluster.yaml, it is "privateDNSZone: None" now

This PR to keep one copy of install-config.yaml for debugging.

[openshift-ci]

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[openshift-ci]

@jianping-shu: all tests passed!

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.39%. Comparing base (6648a44) to head (b114dae).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/installmanager/installmanager.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2810      +/-   ##
==========================================
- Coverage   50.39%   50.39%   -0.01%     
==========================================
  Files         279      279              
  Lines       34190    34192       +2     
==========================================
  Hits        17231    17231              
- Misses      15595    15596       +1     
- Partials     1364     1365       +1     

Files with missing lines	Coverage Δ
pkg/installmanager/installmanager.go	35.93% <0.00%> (-0.06%)	⬇️

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