Comment 4 for bug 1924956

To Hiromu Asahina:
Sorry, I don't know this bug has assigned to you.
In my branch https://review.opendev.org/c/openstack/tacker/+/795016, I have fixed this bug just delete the `plugin` arg in `conductor_server` to make my modification for get_grant_resource_scale_out can work correctly.
If you have other solutions, I can withdraw the modification or you can comment on my patch and let me modify it.