kubeadm: remove stray "alpha phase" command

This command had a TODO to be removed once kubeadm init phases are
added. Remove the command as init phases are in place already.

Author: neolit123

cmd/kubeadm/app/cmd/alpha/alpha.go

@@ -20,7 +20,6 @@ import (
 	"io"
 
 	"github.com/spf13/cobra"
-	cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
 )
 
 // NewCmdAlpha returns "kubeadm alpha" command.
@@ -34,20 +33,5 @@ func NewCmdAlpha(in io.Reader, out io.Writer) *cobra.Command {
 	cmd.AddCommand(newCmdKubeConfigUtility(out))
 	cmd.AddCommand(NewCmdSelfhosting(in))
 
-	// TODO: This command should be removed as soon as the kubeadm init phase refactoring is completed.
-	//		 current phases implemented as cobra.Commands should become workflow.Phases, while other utilities
-	// 		 hosted under kubeadm alpha phases command should found a new home under kubeadm alpha (without phases)
-	cmd.AddCommand(newCmdPhase(out))
-
-	return cmd
-}
-
-func newCmdPhase(out io.Writer) *cobra.Command {
-	cmd := &cobra.Command{
-		Use:   "phase",
-		Short: "Invoke subsets of kubeadm functions separately for a manual install",
-		Long:  cmdutil.MacroCommandLongDescription,
-	}
-
 	return cmd
 }