Giulio Fidente 0dfc81ad15 Add documentation on how to use an external Ceph cluster
This adds a section describing how to configure an Overcloud to
use an external Ceph cluster for one or multiple services.

Change-Id: I782a95db0354146d60d61ad32b4ee27309d113d6
2016-11-16 10:10:18 +00:00
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