Remove unused uses that are causing check-cs to fail

Remove all unused uses causing check-cs to fail

EDIT: I Didn't notice the unused uses fixer wasn't enabled for the tests folder, so the problem is cs-check-cs.sh itself.

@Maks3w Some of the tests, i guess is the second one, is showing up this message "Loaded config from "/var/www/zf2/./tests/.php_cs"", which makes the check-cs.sh think there is an error. As you're working with that checker, could you please take a look at that? All PR's are failing in Travis, even with no errors.