ipc: Update to tokio 1.0.

  - In assuan:

    - tokio::io::AsyncRead::poll_read now uses a ReadBuf buffer instead
      of a &mu [u8], so use that and write to the Client's buffer only
      if a read was successful.

    - Poll::Ready does not report n_read any more, so there cannot be a
      conflict between the reported and actual number of bytes read,
      remove that case.

  - Fixes #780.

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