Merge pull request #63170 from micahhausler/node-ip-fix

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Report node DNS info with --node-ip

**What this PR does / why we need it**:
This PR adds `ExternalDNS`, `InternalDNS`, and `ExternalIP` info for kubelets with the `--nodeip` flag enabled. 

**Which issue(s) this PR fixes** 
Fixes #63158

**Special notes for your reviewer**:

I added a field to the Kubelet to make IP validation more testable (`validateNodeIP` relies on the `net` package and the IP address of the host that is executing the test.) I also converted the test to use a table so new cases could be added more easily.

**Release Notes**
```release-note
Report node DNS info with --node-ip flag
```

@andrewsykim
@nckturner 

/sig node
/sig network

pkg/kubelet/kubelet.go

@@ -520,6 +520,7 @@ func NewMainKubelet(kubeCfg *kubeletconfiginternal.KubeletConfiguration,
 		containerManager:     kubeDeps.ContainerManager,
 		containerRuntimeName: containerRuntime,
 		nodeIP:               parsedNodeIP,
+		nodeIPValidator:      validateNodeIP,
 		clock:                clock.RealClock{},
 		enableControllerAttachDetach:            kubeCfg.EnableControllerAttachDetach,
 		iptClient:                               utilipt.New(utilexec.New(), utildbus.New(), utilipt.ProtocolIpv4),
@@ -1069,6 +1070,9 @@ type Kubelet struct {
 	// If non-nil, use this IP address for the node
 	nodeIP net.IP
 
+	// use this function to validate the kubelet nodeIP
+	nodeIPValidator func(net.IP) error
+
 	// If non-nil, this is a unique identifier for the node in an external database, eg. cloudprovider
 	providerID string