Merge pull request kubernetes#55237 from andrewsykim/kubeadm-remove-priority-admission

Automatic merge from submit-queue (batch tested with PRs 53273, 55058, 55237, 50140). 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>.

kubeadm: remove priority admission controller for v1.9

**What this PR does / why we need it**:
Removes Priority Admission Controller in kubeadm since it's currently in alpha. 

**Release note**:
```release-note
Removes Priority Admission Controller from kubeadm since it's alpha. 
```

cc @luxas

Author: Kubernetes Submit Queue

cmd/kubeadm/app/phases/controlplane/manifests.go

@@ -41,8 +41,8 @@ const (
 	DefaultCloudConfigPath = "/etc/kubernetes/cloud-config"
 
 	defaultV18AdmissionControl    = "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota"
-	deprecatedV19AdmissionControl = "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,Priority,ResourceQuota"
-	defaultV19AdmissionControl    = "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,Priority,ResourceQuota"
+	deprecatedV19AdmissionControl = "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota"
+	defaultV19AdmissionControl    = "Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota"
 )
 
 // CreateInitStaticPodManifestFiles will write all static pod manifest files needed to bring up the control plane.

cmd/kubeadm/app/phases/controlplane/manifests_test.go

@@ -362,7 +362,7 @@ func TestGetAPIServerCommand(t *testing.T) {
 			expected: []string{
 				"kube-apiserver",
 				"--insecure-port=0",
-				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,Priority,ResourceQuota",
+				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota",
 				"--service-cluster-ip-range=bar",
 				"--service-account-key-file=" + testCertsDir + "/sa.pub",
 				"--client-ca-file=" + testCertsDir + "/ca.crt",
@@ -399,7 +399,7 @@ func TestGetAPIServerCommand(t *testing.T) {
 			expected: []string{
 				"kube-apiserver",
 				"--insecure-port=0",
-				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,Priority,ResourceQuota",
+				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota",
 				"--service-cluster-ip-range=bar",
 				"--service-account-key-file=" + testCertsDir + "/sa.pub",
 				"--client-ca-file=" + testCertsDir + "/ca.crt",
@@ -435,7 +435,7 @@ func TestGetAPIServerCommand(t *testing.T) {
 			expected: []string{
 				"kube-apiserver",
 				"--insecure-port=0",
-				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,Priority,ResourceQuota",
+				"--admission-control=Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeLabel,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota",
 				"--service-cluster-ip-range=bar",
 				"--service-account-key-file=" + testCertsDir + "/sa.pub",
 				"--client-ca-file=" + testCertsDir + "/ca.crt",