Support txn insert when table sync

[lsy3993]

Txn insert is the SQL which starts with 'BEGIN' and ends with 'COMMIT/ROLLBACK'.

The general SQL may be like this :

insert

        begin; 
        insert into t1  select id, '2017-02-28', 'y1' from t2 where id = 3;
        insert into t1  select id, '2017-02-28', 'y1' from t2 where id = 5;
        insert into t1  select id, '2017-03-31', 'x' from t2 where id = 4;
        commit;

update + insert

        begin;
        update t1 set city = 'xxx' where user_id = 3; 
        insert into t1 select id + 1, '2017-02-28', 'yyy' from t2 where id = 5;
        commit;

delete + insert

        begin;
        delete from t1 PARTITION p201702 where user_id = 5;
        insert into t1 select id, '2017-02-28', 'new_y1' from t2 where id = 5;
        commit;

insert + update + delete

        begin;
        delete from t1 PARTITION p201702 where user_id = 6;
        insert into t1 select id + 2, '2017-02-28', 'y1' from t2 where id = 5;
        update t1 set city = 'new_city' where user_id = 5; 
        commit;

DB sync will support later.