vm-virtio: vhost-user-blk: Expect an identifier upon device creation

This identifier is chosen from the DeviceManager so that it will manage
all identifiers across the VM, which will ensure uniqueness.

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

vmm/src/device_manager.rs

@@ -1201,7 +1201,7 @@ impl DeviceManager {
                 queue_size: disk_cfg.queue_size,
             };
             let vhost_user_block_device = Arc::new(Mutex::new(
-                vm_virtio::vhost_user::Blk::new(disk_cfg.wce, vu_cfg)
+                vm_virtio::vhost_user::Blk::new(id, disk_cfg.wce, vu_cfg)
                     .map_err(DeviceManagerError::CreateVhostUserBlk)?,
             ));