Fixed support for PointType with Mysql.

this change will create a conn for defaut values, which is "sqlite". because we add the DISTANCE function (and point type) only for psql and mysql, that'w why it fails.

You should use the environment variable defined by travis to check which driver to use. f:e:

``` php
$em = $this->getEntityManager(null, null, [
    'driver' => getenv('DB') == 'mysql' ? 'pdo_mysql' : 'pdo_pgsql',
    'dbname' => 'orm_behaviors_test',
]);

```
    
or anything better than my code  if you find out :)