Tests: sorted h2.t tests.

A test for partial request body is moved closer to relatives.
This also fixes graceful shutdown tests that depend on timings.

h2.t

diff --git a/h2.t b/h2.t
index 113ae17..4096dce 100644
--- a/h2.t
+++ b/h2.t
@@ -695,6 +695,15 @@
 ($frame) = grep { $_->{type} eq "PING" && $_->{flags} & 0x1 } @$frames;
 ok($frame, 'client body timeout - PING');
 
+# partial request body data frame with connection close after body timeout
+
+$s = Test::Nginx::HTTP2->new(port(8087));
+$sid = $s->new_stream({ path => '/proxy/t2.html', body_more => 1 });
+$s->h2_body('TEST', { split => [ 12 ], abort => 1 });
+
+select undef, undef, undef, 1.1;
+undef $s;
+
 # proxied request with logging pristine request header field (e.g., referer)
 
 $s = Test::Nginx::HTTP2->new();
@@ -1155,15 +1164,6 @@
 $sid = $grace3->new_stream({ path => '/proxy2/t2.html', body_more => 1 });
 $grace3->h2_body('TEST', { body_more => 1 });
 
-# partial request body data frame with connection close after body timeout
-
-my $grace4 = Test::Nginx::HTTP2->new(port(8087));
-$sid = $grace4->new_stream({ path => '/proxy/t2.html', body_more => 1 });
-$grace4->h2_body('TEST', { split => [ 12 ], abort => 1 });
-
-select undef, undef, undef, 1.1;
-undef $grace4;
-
 # GOAWAY without awaiting active streams, further streams ignored
 
 $s = Test::Nginx::HTTP2->new(port(8080));