sw test tool: Fix to compare OFPMatch using masks without byte boundary
sw test tool: Fix to compare OFPMatch using masks without byte boundary

Mask lengths without byte boundary are fixed as follows:

 - VLAN_VID, from 16 bits (2 bytes) to 12 + 1 bits
 - IPV6_EXTHDR, from 16 bits (2 bytes) to 9 bits

Reported-by: Arne Goetje <58fcf6192cad7cf1f940b281b0f28bb32649ad98@accton.com>
Signed-off-by: Yuichi Ito <7a83edf5b53f0b21d4182a3da7518164ce03dc3a@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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