Add ceph-calamari role for deploying Calamari

Signed-off-by: Tim Serong <tserong@suse.com>
I've submitted https://github.com/ceph/calamari/pull/230 for this, so once that's nailed down I'll reimplement the above in terms of it. Until then I'm (personally) happy for this to go in as-is with my unholy hack.