[disk] drain any remaining data before Put returns #474
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io.PipeWriter Write calls block until all the data written in the call is read from the corresponding io.PipeReader. If we don't read all that data, then the writing goroutine will block forever.
The PipeWriter used in bytestream Write calls is intended to be consumed by disk.Put(), but if that returns early then there will be blocked writes. To un-block them, we should ensure that any remaining data is drained before disk.Put returns.
This might fix #473