p_haul_img: add timestamp in a directory name

They would look like

/var/local/p.haul-fs/14.03.20-15.46-JhC3ok/

IMHO: it's more convenient
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>