feature: When show the table structure,it will support keyword display "AUTO INCREMENT".

[haitaoguan]

###InnoDB
create table ttt(id int primary key auto_increment,name varchar(5));
insert into ttt(name) values('AAA');

mysql> show create table ttt\G
*************************** 1. row ***************************
       Table: ttt
Create Table: CREATE TABLE `ttt` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(5) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)

###Tianmu
mysql> show create table ttt\G
*************************** 1. row ***************************
       Table: ttt
Create Table: CREATE TABLE `ttt` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(5) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4
1 row in set (0.01 sec)

[davidshiz]

Similar to #1059