PowerDNS backend tests
PowerDNS backend tests

Using the database fixture, test that operations complete with no
exceptions.

Change-Id: I9492d8eadc391ae38533ba7593ec4d18e735ab98

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