WL#2930 Adding view and cursor 'protocols' to mysqltest

- Cleanup of mysqltest.c before extending it

mysql-test/t/group_by.test

@@ -596,9 +596,7 @@ drop table t1;
                     
 CREATE TABLE t1 (n int);
 INSERT INTO t1 VALUES (1);
---disable_ps_protocol
 SELECT n+1 AS n FROM t1 GROUP BY n;
---enable_ps_protocol
 DROP TABLE t1;
 
 #
@@ -623,11 +621,9 @@ insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
 insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
 
 # query with ambiguous column reference 'c2'
---disable_ps_protocol
 select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
 group by c2;
 show warnings;
---enable_ps_protocol
 
 # this query has no ambiguity
 select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4