Promote the last few SQL-inaccessible replication options (command line
or `mariadb.cnf`) as these GLOBAL read-only system variables:
```
@@master_info_file
@@replicate_same_server_id
@@show_slave_auth_info
```
Side effect: The latter two options changed from no argument
to optional argument. Quote `include/my_getopt.h`:
> It should be noted that for historical reasons variables with the
> combination arg_type=NO_ARG, my_option::var_type=GET_BOOL still
> accepts arguments. This is someone counter intuitive and care should
> be taken if the code is refactored.
Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com>
