nova_notifier: fix tests
nova_notifier: fix tests

The prototype for instance_update_and_get_original changed, so let's
ignore it completely for the future.

Change-Id: Icfa161109e76e2717f64084ddce829f6c68aeb57
Fixes-Bug: #1221173

rackerlabs/instrumented-ceilometer,redhat-openstack/ceilometer,froyobin/ceilometer,cernops/ceilometer,eayunstack/ceilometer,NeCTAR-RC/ceilometer,r-mibu/ceilometer,openstack/ceilometer,citrix-openstack-build/ceilometer,tanglei528/ceilometer,tanglei528/ceilometer,sileht/aodh,redhat-openstack/ceilometer,mathslinux/ceilometer,mathslinux/ceilometer,pkilambi/ceilometer,rickerc/ceilometer_audit,rickerc/ceilometer_audit,tanglei528/ceilometer,sileht/aodh,Juniper/ceilometer,isyippee/ceilometer,NeCTAR-RC/ceilometer,eayunstack/ceilometer,JioCloud/ceilometer,rickerc/ceilometer_audit,rackerlabs/instrumented-ceilometer,idegtiarov/ceilometer,NeCTAR-RC/ceilometer,pczerkas/aodh,ityaptin/ceilometer,fabian4/ceilometer,cernops/ceilometer,r-mibu/ceilometer,m1093782566/openstack_org_ceilometer,idegtiarov/ceilometer,MisterPup/Ceilometer-Juno-Extension,pczerkas/aodh,luogangyi/Ceilometer-oVirt,JioCloud/ceilometer,fabian4/ceilometer,isyippee/ceilometer,chungg/aodh,MisterPup/Ceilometer-Juno-Extension,maestro-hybrid-cloud/ceilometer,citrix-openstack-build/ceilometer,ityaptin/ceilometer,Juniper/ceilometer,luogangyi/Ceilometer-oVirt,maestro-hybrid-cloud/ceilometer,JioCloud/ceilometer,openstack/aodh,chungg/aodh,citrix-openstack-build/ceilometer,froyobin/ceilometer,m1093782566/openstack_org_ceilometer,pkilambi/ceilometer,openstack/ceilometer,openstack/aodh,rackerlabs/instrumented-ceilometer