test_infra: do not output interval values for iperf3
We only care about the end result.
@@ -1517,6 +1517,8 @@ pub fn measure_virtio_net_throughput(
&format!("{}", default_port + n),
"-t",
&format!("{test_timeout}"),
+ "-i",
+ "0",
]);
// For measuring the guest transmit throughput (as a sender),
// use reverse mode of the iperf3 client on the host
