Radosgw port from upstream (WIP)

1. This is not tested yet.

2. New comments (like 'this is from file XY") are for review only, will be removed


Depends on https://github.com/crowbar/barclamp-ceph/pull/56
This is strange, I think. It prevents redeploying of the parts inside. Which was intended, I assume, but sometimes it might be wanted.