Anytime the state for a slice or sliver changes, inject a geni style event
into the local event stream. These events are different then normal emulab events in that the SITE is set to the URN of the aggregate, and there is json representation of the slice/sliver status. There are other fields as well that are not in normal emulab events. These events can mix okay with emulab events on the local boss, nothing will care about them. But they will get forwarded to pubsubd at the portal if CLUSTER_PORTAL is set in the defs file.