Ensure Object change lists are sorted during to_primitive
Ensure Object change lists are sorted during to_primitive

This ensures our tests succeed with a random PYTHONHASHSEED value.

Change-Id: I798e0b91f2e515562188b5d14cd7ce2055bd64fb
Partial-Bug: 1348818

muraliselva10/designate,melodous/designate,openstack/designate,cneill/designate-testing,openstack/designate,kiall/designate-py3,melodous/designate,cneill/designate,cneill/designate,ionrock/designate,tonyli71/designate,kiall/designate-py3,cneill/designate-testing,tonyli71/designate,melodous/designate,openstack/designate,cneill/designate,kiall/designate-py3,cneill/designate,kiall/designate-py3,grahamhayes/designate,ramsateesh/designate,muraliselva10/designate,tonyli71/designate,kiall/designate-py3,ramsateesh/designate,cneill/designate,ionrock/designate,grahamhayes/designate,melodous/designate,cneill/designate-testing,grahamhayes/designate,ramsateesh/designate,ionrock/designate,muraliselva10/designate