Actually what we need is to import the urls utils

lib/ansible/modules/extras/notification/grove.py

@@ -94,8 +94,7 @@ def main():
     # Mission complete
     module.exit_json(msg="OK")
 
-#make sure urllib is available for do_notify_grove
-import urllib
 # import module snippets
 from ansible.module_utils.basic import *
+from ansible.module_utils.urls import *
 main()