promoter: Skip qcow tags for fedora
promoter: Skip qcow tags for fedora

For fedora we just run standalone no need for qcows this review just
skip qcows tagging for fedora (there are stuff to fix there to be distro
aware).

Change-Id: I48ff97652813a90a58f524068b0d1723266ade57
Closes-Bug: #1823173

redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra