support changing root dir

[os14]

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[kubesphere-prow]

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This pull-request has been approved by: os14
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[kubesphere-prow]

Welcome @os14! It looks like this is your first PR to kubesphere/kubekey 🎉

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud