Use "operating-system" to denote that an element provides that to the image being created. This can then be used to specify an abstract dependency in other elements to assist in build-time image verification. Change-Id: Ic125803da65e0f8f8c20ef90b08815f4f7d09762
Use Fedora cloud images as the baseline for built disk images.
For further details see the redhat-common README.