mkcephfs: add DEPRECATED warnings to all stdout user interactions
We need to clearly indicate the mkcephfs is no longer the supported tool for doing ceph deployments and that users should use ceph-deploy.
For any STDOUT message, a message should be added notifying the user that the command is deprecated in favour of ceph-deploy.
Warning: mkcephfs is not deprecated in favour of the ceph-deploy tool. Please see: http://github.com/ceph/ceph-deploy