Merge pull request #33262 from errordeveloper/kubeadm

Automatic merge from submit-queue

kubeadm

**What this PR does / why we need it**:

This PR add alpha version of `kubeadm` tool, which allows user to boostrap a cluster rather quite easily. This is the initial contribution from @kubernetes/sig-cluster-lifecycle members, who's aim is to build easy-to-use tools that help to operate a cluster throughout its lifetime.

**Which issue this PR fixes**: a leap towards kubernetes/features#11

**Special notes for your reviewer**: previously seen by many folks in #31221

**Release note**:

```release-note
`kubeadm` (alpha) provides an easy way to securely bootstrap Kubernetes on Linux, see http://kubernetes.io/docs/kubeadm/
```

hack/.linted_packages

@@ -15,6 +15,7 @@ cmd/kube-discovery
 cmd/kube-dns
 cmd/kube-proxy
 cmd/kubeadm
+cmd/kubeadm
 cmd/kubectl
 cmd/kubelet
 cmd/kubernetes-discovery

hack/lib/golang.sh

@@ -35,6 +35,7 @@ kube::golang::server_targets() {
     cmd/kube-apiserver
     cmd/kube-controller-manager
     cmd/kubelet
+    cmd/kubeadm
     cmd/kubemark
     cmd/hyperkube
     plugin/cmd/kube-scheduler

hack/verify-flags/known-flags.txt

@@ -9,6 +9,8 @@ all-namespaces
 allocate-node-cidrs
 allow-privileged
 allowed-not-ready-nodes
+api-advertise-addresses
+api-external-dns-names
 api-burst
 api-prefix
 api-rate
@@ -176,6 +178,10 @@ experimental-keystone-url
 experimental-nvidia-gpus
 experimental-prefix
 experimental-runtime-integration-type
+external-etcd-cafile
+external-etcd-certfile
+external-etcd-endpoints
+external-etcd-keyfile
 external-hostname
 external-ip
 extra-peer-dirs
@@ -385,6 +391,7 @@ pod-cidr
 pod-eviction-timeout
 pod-infra-container-image
 pod-manifest-path
+pod-network-cidr
 pod-running
 pods-per-core
 policy-config-file
@@ -448,6 +455,7 @@ runtime-config
 runtime-integration-type
 runtime-request-timeout
 save-config
+schedule-pods-here
 scheduler-config
 scheduler-name
 schema-cache-dir
@@ -462,6 +470,8 @@ service-account-lookup
 service-account-private-key-file
 service-address
 service-cluster-ip-range
+service-cidr
+service-dns-domain
 service-generator
 service-node-port-range
 service-node-ports
@@ -522,6 +532,7 @@ update-period
 upgrade-image
 upgrade-target
 use-kubernetes-cluster-service
+use-kubernetes-version
 user-whitelist
 verify-only
 volume-dir