virtio-devices: Make EpollHandler more generic

Instead of passing only the event type through the handle_event()
callback, we make the trait slightly more generic by providing the
epoll event to each virtio device implementation.

This is particularly useful for vsock as it will need the event set.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

virtio-devices/src/console.rs

@@ -193,8 +193,9 @@ impl ConsoleEpollHandler {
 }
 
 impl EpollHelperHandler for ConsoleEpollHandler {
-    fn handle_event(&mut self, _helper: &mut EpollHelper, event: u16) -> bool {
-        match event {
+    fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
+        let ev_type = event.data as u16;
+        match ev_type {
             INPUT_QUEUE_EVENT => {
                 if let Err(e) = self.input_queue_evt.read() {
                     error!("Failed to get queue event: {:?}", e);