Add dns capabilities for Windows CNI plugins

[feiskyer]

What this PR does / why we need it:

This PR adds dns capabilities for Windows CNI plugins, so that Windows plugins could setup container's dns based on the capability.

// cniDNSConfig maps to the windows CNI dns Capability.
// Note that dns capability is only used for Windows containers.
type cniDNSConfig struct {
	// List of DNS servers of the cluster.
	Servers []string `json:"servers,omitempty"`
	// List of DNS search domains of the cluster.
	Searches []string `json:"searches,omitempty"`
	// List of DNS options.
	Options []string `json:"options,omitempty"`
}

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #66801 #66588 #65016

Special notes for your reviewer:

Windows CNI plugins should be updated with supporting dns capability.

See also #63905 (comment).

Release note:

Add dns capabilities for Windows CNI plugins:

"dns" {
  "servers": ["10.0.0.10"],
  "searches": ["default.svc.cluster.local","svc.cluster.local","cluster.local"],
  "options": []
}

/sig windows
/sig network

/assign @PatrickLang @madhanrm @dineshgovindasamy @dcbw

[k8s-ci-robot]

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In response to this:

What this PR does / why we need it:

This PR adds dns capabilities for Windows CNI plugins, so that Windows plugins could setup container's dns based on the capability.

// cniDNSConfig maps to the windows CNI dns Capability.
// Note that dns capability is only used for Windows containers.
type cniDNSConfig struct {
  // List of DNS servers of the cluster.
  Servers []string `json:"servers,omitempty"`
  // List of DNS search domains of the cluster.
  Searches []string `json:"searches,omitempty"`
  // List of DNS options.
  Options []string `json:"options,omitempty"`
}

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #66801 #66588 #65016

Special notes for your reviewer:

Windows CNI plugins should be updated with supporting dns capability.

See also #63905 (comment).

Release note:

Add dns capabilities for Windows CNI plugins:

"dns" {
 "servers": ["10.0.0.10"],
 "searches": ["default.svc.cluster.local","svc.cluster.local","cluster.local"],
 "options": []
}

/sig windows
/sig network

/assign @PatrickLang @madhanrm @dineshgovindasamy @dcbw

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[feiskyer]

/retest

[feiskyer]

/milestone v1.12

[PatrickLang]

@dineshgovindasamy or @madhanrm - can you do a review and update wincni?

[feiskyer]

/test pull-kubernetes-e2e-kops-aws

[PatrickLang]

/LGTM

@madhanrm any comments?

[madhanrm]

lgtm

[feiskyer]

@Random-Liu @dcbw Could you help to take a look at this PR?

[feiskyer]

@freehan @anfernee Addressed comments, PTAL

[feiskyer]

/test pull-kubernetes-kubemark-e2e-gce-big

[anfernee]

options could be nil, right?

[feiskyer]

Yep, ok will be false in that case

[anfernee]

I thought it would panic. surprised it won't.

[nikopen]

Looks good for approval @anfernee @freehan ?

/lgtm

[anfernee]

we should have a better abstraction for windows/linux implementation to reconcile as @thockin pointed out. but it's not necessarily blocking this PR.
/lgtm

[anfernee]

@dchen1107 @thockin to approve?

[dchen1107]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dchen1107, feiskyer

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[PatrickLang]

/test pull-kubernetes-e2e-kops-aws

[nikopen]

/retest

[feiskyer]

@nikopen @dchen1107 @anfernee Thanks a lot for reviewing!

we should have a better abstraction for windows/linux implementation to reconcile as @thockin pointed out.

#60338 (comment) is tracking this. @anfernee Appreciate if you have other suggestions to make it better.

[feiskyer]

/retest

[fejta-bot]

/retest
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