virtio-devices: net: Add support for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS

This allows the guest to reprogram the offload settings and mitigates
issues where the Linux kernel tries to reprogram the queues even when
the feature is not advertised.

Fixes: #2528

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

virtio-devices/src/vhost_user/net.rs

@@ -247,7 +247,7 @@ impl VirtioDevice for Net {
                 mem: mem.clone(),
                 kill_evt,
                 pause_evt,
-                ctrl_q: NetCtrl::new(cvq_queue, cvq_queue_evt),
+                ctrl_q: NetCtrl::new(cvq_queue, cvq_queue_evt, None),
             };
 
             let paused = self.common.paused.clone();