support alternative labels (e.g. "wiai.autostart=rocks")

discover.py

@@ -40,7 +40,11 @@ if __name__ == "__main__":
 	parser.add_argument("service_dir", nargs="+")
 	parser.add_argument("--action", "-a", default="up -d")
 	parser.add_argument("--list", "-l", action="store_true", help="list autostart services only, no action")
+	parser.add_argument("--key", "-k", help="alternative label")
 	args = parser.parse_args()
+	
+	if args.key:
+		AUTOSTART_KEY = args.key
 	services = find_services(args.service_dir)
 	autostarts = find_autostart_services(services)
 	if args.list: