Fix #884 (#916)

* Fixed #884

* Remove yggdrasil and yggdrasilctl

* Fixed #884

Co-authored-by: asolana <asolana@deloitte.es>
Co-authored-by: solanav <solanav1337@gmail.com>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

cmd/yggdrasil/main.go

@@ -247,7 +247,12 @@ func run(args yggArgs, ctx context.Context) {
 		return
 	default:
 		// No flags were provided, therefore print the list of flags to stdout.
+		fmt.Println("Usage:")
 		flag.PrintDefaults()
+
+		if args.getaddr || args.getsnet {
+			fmt.Println("\nError: You need to specify some config data using -useconf or -useconffile.")
+		}
 	}
 	// Have we got a working configuration? If we don't then it probably means
 	// that neither -autoconf, -useconf or -useconffile were set above. Stop