message: Enabling/disabling interrupts for Network driver
  This commit enables the toggling of notifications/interrupts by the
  network device for receiving packets. For sending packets, notifications
  are always disabled.
  Furthermore cleaned some comments and an unused and unimplemnted
  function.
diff: @@ -846,10 +846,6 @@ impl Descriptor {
  desc_bytes
  }
  -
  - fn is_used() {
  - unimplemented!();
  - }
  }
  /// Driver and device event suppression struct used in packed virtqueues.
  