stun actor: add back log message to inform of autodiscovery result

src/stun_actor.rs

@@ -120,6 +120,16 @@ impl StunAutodiscovery {
             address: discovered_addr,
         };
 
+        let msg = format!(
+            "STUN autodiscovery result: {} -> {:?}",
+            self.consul_key, discovered_addr
+        );
+        if self.last_result.as_ref().and_then(|x| x.address) != discovered_addr {
+            info!("{}", msg);
+        } else {
+            debug!("{}", msg);
+        }
+
         consul
             .kv_put(&self.consul_key, serde_json::to_vec(&current_result)?)
             .await?;