Use jsonutils instead of json in test/api.py
Use jsonutils instead of json in test/api.py

Also remove the then unused json import

Change-Id: I5570981e04487301c1bf723c04b266fc445aed1e

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