[1.6.x] Made test for issue 19552 compatible with Windows.
[1.6.x] Made test for issue 19552 compatible with Windows.

Take in account platform path separator. Refs #19552.

651bed0918 from master.

dex4er/django,felixjimenez/django,redhat-openstack/django,django-nonrel/django,felixjimenez/django,felixjimenez/django,django-nonrel/django,django-nonrel/django,redhat-openstack/django,django-nonrel/django,redhat-openstack/django,dex4er/django,dex4er/django,felixjimenez/django,redhat-openstack/django