Description:
------------
I've tested the mysqlnd_ms extension with a simple setup using one master and one 
slave with eventual consistency (age:1), but the master was always selected for 
select queries. i found this code and i'm not sure about the correctness of the if 
statement

/* Must be QOS_OPTION_AGE */
if ((lag > 0) && (lag <= filter_data->option_data.age)) {							
  zend_llist_add_element(selected_slaves, &element);
}

if "seconds behind master" is 0 (zero), the slave should be a possible element. so 
the if statement should be:


/* Must be QOS_OPTION_AGE */
if ((lag >= 0) && (lag <= filter_data->option_data.age)) {							
  zend_llist_add_element(selected_slaves, &element);
}