Remove Ceph packages from remote hosts and purge all data.

def make_purge(parser):
    """
    Remove Ceph packages from remote hosts and purge all data.
    """
    parser.add_argument(
        'host',
        metavar='HOST',
        nargs='+',
        help='hosts to purge Ceph from',
        )
    parser.set_defaults(
        func=purge,
        )