message: protocol.Serializer: Improve write logs.
diff: @@ -137,13 +137,6 @@ namespace elle
  boost::optional<elle::Buffer::Size> size = boost::none)
  {
  elle::Buffer::Size to_send = size ? size.get() : content.size();
  - ELLE_DEBUG_SCOPE("write %s '%f' at offset %s (write size: %s)",
  - to_send == content.size()
  - ? std::string{"whole"}
  - : elle::sprintf("%s bytes from", to_send),
  - content,
  - offset,
  - write_size);
  if (write_size)
  Serializer::Super::uint32_put(stream, to_send, version);
  stream.write(
  @@ -303,7 +296,7 @@ namespace elle
  {
  if (control != Control::pong && control != Control::ping)
  this->write_pings_pongs(false);
  - ELLE_DUMP_SCOPE("send control %s", (int) control);
  + ELLE_DEBUG_SCOPE("send control %s", (int) control);
  char c = static_cast<char>(control);
  this->_stream.write(&c, 1);
  }
  @@ -429,7 +422,8 @@ namespace elle
  auto send = [&]
  {
  auto to_send = std::min(this->_chunk_size, packet.size() - offset);
  - ELLE_DEBUG("send actual data: %s", to_send)
  + ELLE_DEBUG_SCOPE("send %s bytes of data at offset %s",
  + to_send, offset);
  elle::protocol::write(
  this->_stream,
  this->version(), packet, false, offset, to_send);
  @@ -451,7 +445,6 @@ namespace elle
  }
  while (offset < packet.size())
  {
  - ELLE_DEBUG("writing control: o=%s, size=%s", offset, packet.size());
  elle::With<elle::reactor::Thread::NonInterruptible>() << [&]
  {
  this->write_control(Control::keep_going);
  