[1.5.x] Prevented leftover files and dirs in admin_scripts tests
[1.5.x] Prevented leftover files and dirs in admin_scripts tests

Backport of d30516e1 from master.

bliti/django-nonrel-1.5,imtapps/django-imt-fork,hasadna/django,hasadna/django,ccn-2m/django,imtapps/django-imt-fork,bliti/django-nonrel-1.5,hasadna/django,imtapps/django-imt-fork,bliti/django-nonrel-1.5,alx-eu/django,ccn-2m/django,ccn-2m/django,alx-eu/django,alx-eu/django,alx-eu/django,ccn-2m/django