[master] f6ee60cb6 vtc: Attempt at stabilizing t02020

[Dridi Boukelmoune]

commit f6ee60cb6c3791568e08da013f0ebc16004d9640
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Wed Sep 1 14:44:35 2021 +0200

    vtc: Attempt at stabilizing t02020
    
    Suggestions from Martin.

diff --git a/bin/varnishtest/tests/t02020.vtc b/bin/varnishtest/tests/t02020.vtc
index 77738e17f..d1bd95c32 100644
--- a/bin/varnishtest/tests/t02020.vtc
+++ b/bin/varnishtest/tests/t02020.vtc
@@ -15,10 +15,12 @@ server s1 {
 } -start
 
 varnish v1 -vcl+backend {
+	import std;
 	import vtc;
 	sub vcl_recv {
 		if (req.url == "/3") {
 			vtc.barrier_sync("${b1_sock}");
+			std.cache_req_body(128k);
 		}
 	}
 } -start
@@ -26,6 +28,7 @@ varnish v1 -vcl+backend {
 varnish v1 -cliok "param.set feature +http2"
 varnish v1 -cliok "param.reset h2_initial_window_size"
 varnish v1 -cliok "param.reset h2_rx_window_low_water"
+varnish v1 -cliok "param.set fetch_chunksize 129k"
 varnish v1 -cliok "param.set debug +syncvsl"
 
 client c1 {