add network, kv-store, and http events
add network, kv-store, and http events

this patch adds the remaining 'existence' meters we generate from
notifications.

Change-Id: I7695f4967944eee0d1e20acf3c9b9bc9c32a6a4a
Partial-Bug: #1384874

openstack/ceilometer,cernops/ceilometer,openstack/aodh,ityaptin/ceilometer,sileht/aodh,maestro-hybrid-cloud/ceilometer,pkilambi/ceilometer,eayunstack/ceilometer,mathslinux/ceilometer,isyippee/ceilometer,fabian4/ceilometer,ityaptin/ceilometer,pczerkas/aodh,chungg/aodh,r-mibu/ceilometer,maestro-hybrid-cloud/ceilometer,isyippee/ceilometer,mathslinux/ceilometer,pkilambi/ceilometer,idegtiarov/ceilometer,redhat-openstack/ceilometer,pczerkas/aodh,r-mibu/ceilometer,chungg/aodh,eayunstack/ceilometer,openstack/ceilometer,fabian4/ceilometer,idegtiarov/ceilometer,cernops/ceilometer,redhat-openstack/ceilometer,openstack/aodh,sileht/aodh