fix mysqlslap --ssl-mode=disable not working issue

[slowtech]

Description:
Specifying --ssl-mode=disable in mysqlslap has no effect, SSL is still used.

How to repeat:

1. first create a test database and account.

create database mysqlslap;
create user 'root'@'127.0.0.1' identified by '123456';
grant all on *.* to 'root'@'127.0.0.1';
set global general_log=on;

2. then execute the mysqlslap
   ./mysqlslap --host=127.0.0.1 --port=3316 --user=root --password="123456" --concurrency=1 --iterations=1 --query="select 1" --ssl-mode=disable

3. check the output of general log.

2024-11-17T19:17:15.942857+08:00           14 Connect   [email protected] on  using TCP/IP
2024-11-17T19:17:15.958012+08:00           15 Connect   [email protected] on mysqlslap using SSL/TLS
2024-11-17T19:17:15.958916+08:00           15 Query     select 1
2024-11-17T19:17:15.959572+08:00           15 Quit
2024-11-17T19:17:15.960218+08:00           14 Quit

Why it happens:
In the run_task function, after initializing MYSQL, MYSQL is not set according to the options in the mysqlslap command. This step is only done in the main function.

How to fix:
Put the MYSQL setting operation separately in the set_mysql_options function. After initializing MYSQL, call set_mysql_options to set MYSQL.

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