getfedora/atomic update

[Josh Berkus]

Folks,

For the F25 release, we want to update getfedora/cloud to
getfedora/atomic.  But this means having a bunch of new content, and
simplifying the list of available downloads.

Here's my stab at it:

https://fedoraproject.org/wiki/Cloud/getfedora_update

Let's discuss this tommorrow during the meeting.