Fix Kubeadm template format

[dominicqi]

When using kubeProxyMode: none The current kubeadm template will produce

ERROR: failed to create cluster: failed to generate kubeadm config content: error executing config template: Invalid YAML Template

I found out the kubeadm template will drop the line breaker if InitSkipPhases is more than one, playground https://go.dev/play/p/-wJhmxW6w43 .

[linux-foundation-easycla]

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• ✅ login: dominicqi / name: qiyang (f96632a)

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[neolit123]

thanks for the go playground reproducer.
{{- range $phase := .InitSkipPhases }} is correct
/lgtm

[neolit123]

/ok-to-test

[stmcginnis]

/lgtm

[BenTheElder]

/lgtm
/approve
nice catch!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, dominicqi

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