If "kpartx -av" is called and there is no unused /dev/loop* device, then kpartx fails. Calling "losetup -f" finds first unused device and creates it if it doesn't exist. Fixes bug #1195264 Change-Id: I5d59b519fd8e2a7380b71a788f9d3f2331b6567f
Use Fedora cloud images as the baseline for built disk images.
Overrides:
- To use a non-default URL for downloading base Fedora cloud images, use the environment variable DIB_CLOUD_IMAGES
- To download a non-default release of Fedora cloud images, use the environment variable DIB_RELEASE