ofproto/ofproto_v1_0_parser: make FlowMod allow meaningful default parameter
ofproto/ofproto_v1_0_parser: make FlowMod allow meaningful default parameter

Signed-off-by: Isaku Yamahata <4b3abd66323411eeceff090ab3754dd766fc4b25@valinux.co.jp>
Reviewed-by: Simon Horman <088e16a1019277b15d58faf0541e11910eb756f6@horms.net>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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