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7ddfc28309
In the course of executing the asyncio data reception callback during a v2 handshake, it's possible that the receive buffer already contains data for after the handshake (usually a VERSION message for inbound connections). If we don't process that data immediately, we would do so after the next message is received, but with the adapted protocol flow introduced in the next commit, there is no next message, as the TestNode wouldn't continue until we send back our own version in `on_version`. Fix this by calling `self._on_data` immediately if there's data left in the receive buffer after a completed v2 handshake.