ceph-cookbooks patches

OSD Deployment:
- Add OSD deployment support when not using crowbar.
- Support OSDs using dm-crypt

MON IP retrieval:
- support for IPv6 addresses (provided that the configuration is stateful or use_tempaddr is set to 0 in a stateless conf)
- support multiple NICs (public_network must be defined)
- if public_network is not defined, we fall back to the previous behavior.

MON deployment:
- Use ceph-create-keys to create client.admin, bootstrap-osd, and bootstrap-mds keys.

APT:
- Update configuration and recipes to be more in line with ceph-deploy.