wwctl completions for no args

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/app/wwctl/configure/dhcp/root.go

@@ -2,6 +2,7 @@ package dhcp
 
 import (
 	"github.com/spf13/cobra"
+	"github.com/warewulf/warewulf/internal/app/wwctl/completions"
 )
 
 var (
@@ -11,8 +12,9 @@ var (
 		Short:                 "Manage and initialize DHCP",
 		Long: "DHCP is a dependent service to Warewulf. This command will configure DHCP as defined\n" +
 			"in the warewulf.conf file.",
-		RunE: CobraRunE,
-		Args: cobra.ExactArgs(0),
+		RunE:              CobraRunE,
+		Args:              cobra.NoArgs,
+		ValidArgsFunction: completions.None,
 	}
 )