Merge pull request kubernetes#54419 from rphillips/fixes/change_endpoint_reconciler_type

Automatic merge from submit-queue (batch tested with PRs 54419, 53545). 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>.

change alpha-endpoint-reconciler-type argument to endpoint-reconciler-type

**What this PR does / why we need it**: Tweaks the endpoint reconciler argument to remove 'alpha', because according to this [comment](kubernetes#50984 (comment)) we are preferring to document the flags.

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

Author: Kubernetes Submit Queue

cmd/kube-apiserver/app/options/options.go

@@ -170,7 +170,7 @@ func (s *ServerRunOptions) AddFlags(fs *pflag.FlagSet) {
 	fs.IntVar(&s.MasterCount, "apiserver-count", s.MasterCount,
 		"The number of apiservers running in the cluster, must be a positive number.")
 
-	fs.StringVar(&s.EndpointReconcilerType, "alpha-endpoint-reconciler-type", string(s.EndpointReconcilerType),
+	fs.StringVar(&s.EndpointReconcilerType, "endpoint-reconciler-type", string(s.EndpointReconcilerType),
 		"Use an endpoint reconciler ("+strings.Join(reconcilers.AllTypes.Names(), ", ")+")")
 
 	// See #14282 for details on how to test/try this option out.

cmd/kube-apiserver/app/options/options_test.go

@@ -46,7 +46,6 @@ func TestAddFlags(t *testing.T) {
 		"--admission-control-config-file=/admission-control-config",
 		"--advertise-address=192.168.10.10",
 		"--allow-privileged=false",
-		"--alpha-endpoint-reconciler-type=" + string(reconcilers.MasterCountReconcilerType),
 		"--anonymous-auth=false",
 		"--apiserver-count=5",
 		"--audit-log-maxage=11",
@@ -72,6 +71,7 @@ func TestAddFlags(t *testing.T) {
 		"--enable-aggregator-routing=true",
 		"--enable-logs-handler=false",
 		"--enable-swagger-ui=true",
+		"--endpoint-reconciler-type=" + string(reconcilers.MasterCountReconcilerType),
 		"--etcd-quorum-read=false",
 		"--etcd-keyfile=/var/run/kubernetes/etcd.key",
 		"--etcd-certfile=/var/run/kubernetes/etcdce.crt",