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b404f10d87
As a next step in refactoring the tunnel implementation, I am removing the `device_handler` task and instead use a poll-based function to read from the device. Removing the task means there is one less component that accesses the `Tunnel` via shared-memory. The final one after this PR is the `peer_handler`. Once all shared-access is gone, we can stop using `Arc<Tunnel>` and with it, remove all uses of `Mutex` in the tunnel and simply use `&mut self`. To remove the `device_handler`, we introduce a `Device::poll_read` function that we call as the very first thing in the `Tunnel`'s poll-function. At a later point, we want to think about prioritization within the event loop. I'd suggest deferring that until we have removed the locks as handling the guards is a bit finicky at this stage.