[py] fix inverted logic and flake8 failure (SeleniumHQ#3346)

py/selenium/webdriver/common/service.py

@@ -127,12 +127,11 @@ def send_remote_shutdown_command(self):
             return
 
         for x in range(30):
-            if self.is_connectable():
+            if not self.is_connectable():
                 break
             else:
                 time.sleep(1)
 
-
     def stop(self):
         """
         Stops the service.