Lots of updates with the node management CLI tools

internal/app/wwctl/group/add/main.go

@@ -14,8 +14,13 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		os.Exit(1)
 	}
 
-	nodeDB.AddGroup(args[0])
-
+	for _, g := range args {
+		err = nodeDB.AddGroup(g)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+	}
 
 	nodeDB.Persist()
 

internal/app/wwctl/group/add/root.go

@@ -8,10 +8,10 @@ var (
 		Short:              "Add a new node group",
 		Long:               "Add a new node group ",
 		RunE:				CobraRunE,
+		Args: 				cobra.MinimumNArgs(1),
 	}
 	SetVnfs string
 	SetKernel string
-	//	SetGroupLevel bool
 )
 
 func init() {