[1.6.x] Fixed set literals for python 2.6
[1.6.x] Fixed set literals for python 2.6

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