Fix dnf config-manager call for test repos
Fix dnf config-manager call for test repos

--set-enabled is the correct config-manager option
--enablerepo is generic dnf option to temporarily enable a repo during
dnf call

https://bugzilla.redhat.com/show_bug.cgi?id=1759139

Change-Id: I1f6b6f238843666d3ece0840ffa8af48ca00734c

redhat-openstack/octario,redhat-openstack/octario