lib/port_no: handling port_no as string
lib/port_no: handling port_no as string

Signed-off-by: YAMADA Hideki <382f20a79c68ed60a19800d5b0d5057a221748a0@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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