ofproto_v1_5_parser: Enable setting mask in OFPActionSetField
ofproto_v1_5_parser: Enable setting mask in OFPActionSetField

OpenFlow Sepc 1.5 allows wildcard to be used in set-field
action (EXT-314).
This patch enables setting mask in set-field action.

Signed-off-by: IWASE Yusuke <bb80e84cc9f5a8f01385872ee89032beb5d4eba7@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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