Testcase: fork child, chdir into /proc/$pid and kill child.

test for http://bugzilla.openvz.org/show_bug.cgi?id=2315Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Andrey Wagin <avagin@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>