fix&refactor: improve connection retry logic and remove unnecessary wait time for AWS instance readiness

desktop_env/controllers/setup.py

@@ -51,7 +51,17 @@ class SetupController:
                     "parameters": dick like {str, Any} providing the keyword
                       parameters
                 }
-        """
+        """  
+        # make sure connection can be established
+        retry = 0
+        while retry < 30:
+            try:
+                _ = requests.get(self.http_server + "/terminal")
+                break
+            except:
+                time.sleep(5)
+                retry += 1
+                logger.info(f"try to connect {self.http_server}, retry {retry}/30")
 
         for cfg in config:
             config_type: str = cfg["type"]