Half closing of connections when CloseWrite() is available #536
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Clean termination when FIN received on one side but there's data remaining to send from the other side. Fixes an issue discovered in a reverse scenario (client -> chiselServer -> chiselClient -> server), where the client would close connection after sending data, but before the server has finished sending data. Without Chisel, same situation, the server is delaying the close because it still wants to send data, and it closes after having sent it. With Chisel, chiselServer was closing the connection immediately first, preventing the server to send its remaining data.
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Fix for issue #535 Non graceful closing of remote connection
Use of CloseWrite() instead of Close() in Pipe(), only when available (typically TCP and SSH Channel).
This triggers EOF on the other side instead of totally closing the TCP connection / SSH Channel, leaving the possibility to receive remaining incoming data.
Also removed sync.Once, as when io.Copy finishes we only WriteClose() or Close() the destination of the copy, which triggers io.Copy to end on the other side in cascade.
Also added dst.Close() in both pipeRemote() and handleTCP() as we still need to Close() even with CloseWrite() called in both directions.