zdtm/pty02: ignore SIGHUP

The test proces opens master and slave points. The slave point becomes
the control terminal for this process. Then the test process forks a
second process and the first process closes the master point. So when a
master point is closed in a second process, the first one will be killed
by SIGHUP.
Reported-by: Victor Konyashkin <vkonyashkin@parallels.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/pty02.c

@@ -81,6 +81,7 @@ int main(int argc, char *argv[])
 	test_daemon();
 	test_waitsig();
 
+	signal(SIGHUP, SIG_IGN);
 	task_waiter_complete(&t, 1);
 
 	ret = read(slave, buf, sizeof(teststr) - 1);