Bug Line: remove file after clone
Test: Repair --run_only

Amend 9240d49802534b7b13902e0d211b606cf1450426: Since many Loaders are
instanciated by unittest itself, filter_test_list still have to be a class
variable
Test displaying and validating a listbox with other field on the page
Listbox: Cleanup REQUEST.cell ( same as 6a83d60 )