Tests: adjusted read timeout in HTTP/2 request buffering tests.

diff --git a/h2_fastcgi_request_buffering.t b/h2_fastcgi_request_buffering.t
index 6d2c373..7f0ac39 100644
--- a/h2_fastcgi_request_buffering.t
+++ b/h2_fastcgi_request_buffering.t

@@ -265,7 +265,7 @@
 	my ($s, $timo) = @_;
 	my $buf = '';
 
-	if (IO::Select->new($s)->can_read($timo || 3)) {
+	if (IO::Select->new($s)->can_read($timo || 5)) {
 		$s->sysread($buf, 16384) or return;
 		log2i($buf);
 	}

diff --git a/h2_proxy_request_buffering.t b/h2_proxy_request_buffering.t
index 8449ff5..f72cc24 100644
--- a/h2_proxy_request_buffering.t
+++ b/h2_proxy_request_buffering.t

@@ -265,7 +265,7 @@
 	my ($s, $timo) = @_;
 	my $buf = '';
 
-	if (IO::Select->new($s)->can_read($timo || 3)) {
+	if (IO::Select->new($s)->can_read($timo || 5)) {
 		$s->sysread($buf, 16384) or return;
 		log2i($buf);
 	}

diff --git a/h2_proxy_request_buffering_ssl.t b/h2_proxy_request_buffering_ssl.t
index 0800f99..76a2383 100644
--- a/h2_proxy_request_buffering_ssl.t
+++ b/h2_proxy_request_buffering_ssl.t

@@ -270,7 +270,7 @@
 	my ($s, $timo) = @_;
 	my $buf = '';
 
-	if (IO::Select->new($s)->can_read($timo || 3)) {
+	if (IO::Select->new($s)->can_read($timo || 5)) {
 		$s->sysread($buf, 16384) or return;
 		log2i($buf);
 	}