As a general rule, MongoDB reads the AGPL generously and broadly to allow unfettered use of the database. See, for example, our licensing policy: http://www.mongodb.org/about/licensing/
I or our legal counsel would be happy to discuss this with the relevant parties at OpenStack. We'd love to see more organizations using MongoDB with OpenStack.
Matt
------- { name : "matt asay", title : "vp, business development & marketing", twitter/skype : "@mjasay", website : "www.mongodb.com" }