rest_firewall: use the explicit max_len of flow_mod
rest_firewall: use the explicit max_len of flow_mod

rest_firewall had used the max_len value of flow_mod message which ofctl_v1_x specified.
in response to change ofctl_v1_x, rest_firewall gets to use the specified max_len explicitly.

Signed-off-by: Yuichi Ito <7a83edf5b53f0b21d4182a3da7518164ce03dc3a@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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