Comment 1 for bug 1788129

I believe during review we intentionally did not add support for server tags when creating a server with cells v1 because cells v1 is deprecated:

https://review.openstack.org/#/c/459593/26/nova/conductor/manager.py@532

This isn't the first new feature in the API that we've omitted for cells v1 because it's deprecated. We'd need to blacklist the test:

https://github.com/openstack/nova/blob/722d5b477219f0a2435a9f4ad4d54c61b83219f1/devstack/tempest-dsvm-cells-rc