Small refactor. Now it is used a class (FunctionalTestRunner) to run the...

Small refactor. Now it is used a class (FunctionalTestRunner) to run the functional tests. This will help create custom Runners for Projects or custom products.

 * It allow not take screenshots with xwud
 * This is just a initial clean up should not change the current behaviours. 
 * More improvements and features will come soon.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32026 20353a03-c40f-0410-a6d1-a30d3c3de9de