udns is not currently in EPEL7 and having it would allow porting few packages.
udns-0.4-3.el7 has been submitted as an update for Fedora EPEL 7. https://admin.fedoraproject.org/updates/udns-0.4-3.el7
udns-0.4-3.el7 has been pushed to the Fedora EPEL 7 testing repository.
udns-0.4-3.el7 has been pushed to the Fedora EPEL 7 stable repository.