Kernel can't suspend container by design if calls clock_gettime()
in a loop, so we need to sleep between clock_gettime().
Signed-off-by: Victor Konyashkin  <vkonyashkin@parallels.com>
Acked-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>