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
According to http://ceph.com/docs/dumpling/radosgw/manual-install/ we should also add 
rgw print continue = false