wwctl completions for no args

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

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

@@ -1,6 +1,9 @@
 package hostfile
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/spf13/cobra"
+	"github.com/warewulf/warewulf/internal/app/wwctl/completions"
+)
 
 var (
 	baseCmd = &cobra.Command{
@@ -9,7 +12,8 @@ var (
 		Short:                 "update hostfile on master",
 		Long:                  "Manage the hostfile on the master node\n",
 		RunE:                  CobraRunE,
-		Args:                  cobra.ExactArgs(0),
+		Args:                  cobra.NoArgs,
+		ValidArgsFunction:     completions.None,
 	}
 )