Rename instance disk I/O counter
Rename instance disk I/O counter

This fixes bug #1060939

Change-Id: I0dc233a9143d64897ef1ad8e3d215f9c0974a432
Signed-off-by: Julien Danjou <5c682c2d1ec4073e277f9ba9f4bdf07e5794dabe@danjou.info>

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