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Description of problem: The package owns /etc/bash_completion.d directory that is already owned by "filesystem" package. Problem triggered by line %dir %{_sysconfdir}/bash_completion.d at http://pkgs.fedoraproject.org/cgit/rpms/dnf.git/tree/dnf.spec#n271 You can fix it by replacing it with %dir %{_sysconfdir}/bash_completion.d/%{name}
You may also be interested in reading https://bugzilla.redhat.com/show_bug.cgi?id=1303441#c1
It's for EPEL7 and not going to fix it now. It will be fixed when DNF 2.0 will come. https://github.com/rpm-software-management/dnf/pull/608