Delete zone.

    Arguments:

        prs:  parser object of argparse
        conn: dictionary of connection information

def parse_delete_zone(prs, conn):
    """Delete zone.

    Arguments:

        prs:  parser object of argparse
        conn: dictionary of connection information
    """
    prs_zone_delete = prs.add_parser('zone_delete', help='delete zone')
    prs_zone_delete.add_argument('--domain', action='store', required=True,
                                 help='specify zone')
    conn_options(prs_zone_delete, conn)
    prs_zone_delete.set_defaults(func=delete_zone)