config/unit: move Type() and Group() out of config

config/config_test.go

@@ -261,9 +261,6 @@ Address=10.209.171.177/19
 		if u.Name != "50-eth0.network" {
 			t.Errorf("Unit has incorrect name %s", u.Name)
 		}
-		if u.Type() != "network" {
-			t.Errorf("Unit has incorrect type '%s'", u.Type())
-		}
 	}
 
 	if cfg.Coreos.OEM.ID != "rackspace" {

config/unit.go

@@ -16,11 +16,6 @@
 
 package config
 
-import (
-	"path/filepath"
-	"strings"
-)
-
 type Unit struct {
 	Name    string `yaml:"name"`
 	Mask    bool   `yaml:"mask"`
@@ -34,17 +29,3 @@ type Unit struct {
 	// until the correct behaviour for multiple drop-in units is determined.
 	DropIn bool `yaml:"-"`
 }
-
-func (u *Unit) Type() string {
-	ext := filepath.Ext(u.Name)
-	return strings.TrimLeft(ext, ".")
-}
-
-func (u *Unit) Group() string {
-	switch u.Type() {
-	case "network", "netdev", "link":
-		return "network"
-	default:
-		return "system"
-	}
-}