Path changes for Atomic and Cloud images
This commit addresses required changes to be done after
renaming of Atomic variant to AtomicHost and CloudImage
variant to Cloud.
- Atomic cloud images has been moved under AtomicHost
- Cloud-Base images has been moved under Cloud
- No Fedora-Cloud-netinstall iso get produced in F28
Ticket - https://pagure.io/fedora-websites/issue/792
Signed-off-by: Sinny Kumari <sinny@redhat.com>