Tests: reduced race in worker_shutdown_timeout test.
Made sure that HUP is sent after an old worker process accepted a connection.
Previously, a new worker process started early could win in accept() race.
diff --git a/worker_shutdown_timeout.t b/worker_shutdown_timeout.t
index 8bdd828..ca81298 100644
--- a/worker_shutdown_timeout.t
+++ b/worker_shutdown_timeout.t
@@ -56,6 +56,8 @@
my $s = http('', start => 1);
+select undef, undef, undef, 0.2;
+
kill 'HUP', $t->read_file('nginx.pid');
if (IO::Select->new($s)->can_read(5)) {
