simple_switch_13: using table-miss flow

OVS has not yet supported table-miss flow completely, but this patch
changes simple_switch_13 to install table-miss flow entry in accordance
with OF1.3 spec.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>