feat(hostd): varlink interfaced host controller to manage machine configuration and boot mgmt

hostd/src/machine.rs

@@ -27,11 +27,9 @@ pub async fn describe(
         .await
         .unwrap();
 
-    let machine_id = manager
-        .machine_id()
-        .await
-        .unwrap()
-        // convert bytes to hex string
+    let bytes = manager.machine_id().await.unwrap();
+    // convert bytes to hex string
+    let machine_id = bytes
         .iter()
         .map(|&b| format!("{:02x}", b))
         .collect::<String>();