certbot will switch to Python 3 sometime in the future. If we want to ship the same version in EPEL 7 we need to provide a Python 3 version of python-certbot-dns-cloudxns.
This package has changed maintainer in the Fedora. Reassigning to the new maintainer of this component.
At this point EPEL7 is less than a year from retirement. I have no plans of shipping certbot packages for Python 3 in EPEL 7.