* The cloud-archive now provides the most recent version of Ceph
  (hammer) and should be preferred over adding a new repo.
* The ceph signing key changed.[1]

[1] https://securityblog.redhat.com/2015/09/17/important-security-notice-regarding-signing-key-and-distribution-of-red-hat-ceph-storage-on-ubuntu-and-centos/

Change-Id: I5992184f115106a9c853d205d7d79c35e1b0cf27
Closes-Bug: #1497507