[feature] support auto_increment option after engine in ddl statement

[hustjieke]

radon should support auto_increment after engine, otherwise we'll get error when prepare table in shift.
create table and insert value:

    // Create test table
    sql = `CREATE TABLE normal(
            id BIGINT(64) UNSIGNED  NOT NULL AUTO_INCREMENT,                                                                                                         
            str VARCHAR(256),                                                                                                                                        
            f FLOAT,
            d DOUBLE,                                                                                                                                                
            i INT,
            PRIMARY KEY (id)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8`
    if _, err := fromConn.Execute(sql); err == nil {
        fromConn.Execute(`INSERT INTO normal(str, f, d, i)                                                                                                           
        VALUES ("3", -3.14, 3.14, 10)`)                                                                                                                              
    }

2020/01/03 03:19:51.752256 query.go:71:    	 [ERROR] 	query[CREATE TABLE `DTtest`.`normal` (
  `id` bigint(64) unsigned NOT NULL AUTO_INCREMENT,
  `str` varchar(256) DEFAULT NULL,
  `f` float DEFAULT NULL,
  `d` double DEFAULT NULL,
  `i` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8].parser.error: syntax error at position 253 near 'auto_increment'
 2020/01/03 03:19:51.752324 server.go:246:    	 [ERROR] 	server.handle.query.from.session[5].error:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use, syntax error at position 253 near 'auto_increment' (errno 1149) (sqlstate 42000)

[BohuTANG]

ACK