[refactor] Kill parent script on exit

setup/so-functions

@@ -1752,7 +1752,7 @@ set_main_ip() {
 			This is not a supported configuration, please remediate and rerun setup.
 		EOM
 		whiptail --title "Security Onion Setup" --msgbox "$message" 10 75
-		exit 1
+		kill -SIGKILL "$(ps --pid $$ -oppid=)"; exit 1
 	fi
 }