lib/packet/packet_base: fix signature of PacketBase.{parser, serialize}
lib/packet/packet_base: fix signature of PacketBase.{parser, serialize}

All subclasses define them as
parser(cls, buf) and serialize(self, payload, prev)
Not parser(cls), serialize(self).

pylint also complains like
> W: 50,4:ipv4.parser: Arguments number differs from overridden method
> W: 65,4:ipv4.serialize: Arguments number differs from overridden method

Signed-off-by: Isaku Yamahata <4b3abd66323411eeceff090ab3754dd766fc4b25@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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