When the connection terminates before all bytes read, we were
getting an io.ErrUnexpectedEOF that was not being handled as
a standard io.EOF resulting in an internal error being raised.
Translate io.ErrUnexpectedEOF to io.EOF so that we return the
normal errors for unexpected content. Add a log message so
that its clear the error is due to the connection being
terminated before all data sent and not the fault of the
gateway.
Ben McClelland
e137e8d375