[refactor] Standardize list inputs to comma separated

setup/so-functions

@@ -392,6 +392,8 @@ collect_dns() {
 		whiptail_invalid_input
 		whiptail_management_interface_dns
 	done
+
+	MDNS=$(echo "$MDNS" | tr -s "," " ") # MDNS needs to be space separated, we prompt for comma separated for consistency
 }
 
 collect_dns_domain() {