[6.0] 071d8e9d0 Make H/2 varnishtest ignore window updates while in rxreq/rxresp

[Dridi Boukelmoune]

commit 071d8e9d098ac77cd665a3001f7c8251e25c1149
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Tue Jun 22 11:49:35 2021 +0200

    Make H/2 varnishtest ignore window updates while in rxreq/rxresp
    
    This makes it easier to not have to know exactly when and how many window
    updates to expect in a test case.

diff --git a/bin/varnishtest/vtc_http2.c b/bin/varnishtest/vtc_http2.c
index 67ba24bae..b72e53228 100644
--- a/bin/varnishtest/vtc_http2.c
+++ b/bin/varnishtest/vtc_http2.c
@@ -2243,9 +2243,11 @@ cmd_rxmsg(CMD_ARGS)
 	else
 		ONLY_H2_CLIENT(s->hp, av);
 
-	f = rxstuff(s);
-	if (!f)
-		return;
+	do {
+		f = rxstuff(s);
+		if (!f)
+			return;
+	} while (f->type == TYPE_WINDOW_UPDATE);
 
 	rcv++;
 	CHKFRAME(f->type, TYPE_HEADERS, rcv, *av);