The no-ACK server treats MessagePack as newline-delimited data. A raw
0x0a byte in the encoded timestamp stops the server from draining the
request, which can leave the client blocked in Write before it applies
the ACK read timeout.
Drain the connection until the client closes it and use a timestamp
that exercises the binary newline case deterministically.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
8dda41b973