packet lib: bpdu: add some constant values
packet lib: bpdu: add some constant values

Signed-off-by: WATANABE Fumitaka <6c314859a5392f5f0c2f5e010c7240be8063009a@nttcom.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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