swim: replace event_bin and member_bin with the passport

Event_bin and member_bin binary packet structures were designed
separately for different purposes. Initially the event_bin was
thought having the same fields as passport + optional old UUID +
optional payload. On the other hand, member_bin was supposed to
store the passport + mandatory payload.

But old UUID was cut off in favour of another way of UUID update.
And payload appeared to be optional in both anti-entropy and
dissemination. It means, that member_bin and event_bin are not
needed anymore as separate structures. This commit replaces them
with the passport completely.

Part of #3234