varnishtest: set -nolen on tx[req|resp] C-L or T-E

bin/varnishtest/tests/b00037.vtc

@@ -13,7 +13,7 @@ varnish v1 -vsl_catchup
 varnish v1 -expect client_req_400 == 1
 
 client c1 {
-	txreq -method POST -hdr "Content-Length: 12" -bodylen 12
+	txreq -method POST -hdr "Content-Length: 12" -hdr "Content-Length: 12" -bodylen 12
 	rxresp
 	expect resp.status == 400
 } -run

bin/varnishtest/vtc_http.c

@@ -786,6 +786,9 @@ http_tx_parse_args(char * const *av, struct vtclog *vl, struct http *hp,
 		} else if (!strcmp(*av, "-nohost")) {
 			nohost = 1;
 		} else if (!strcmp(*av, "-hdr")) {
+			if (!strncasecmp(av[1], "Content-Length:", 15) ||
+			    !strncasecmp(av[1], "Transfer-Encoding:", 18))
+				nolen = 1;
 			if (!strncasecmp(av[1], "Host:", 5))
 				nohost = 1;
 			VSB_printf(hp->vsb, "%s%s", av[1], nl);