update dud backend test activation to use new api
update errorevent api in aggregator
add error event to test dudrequester
fix a couple issues in backend wrt. activation and deactivation
make all dud backend tests pass
update state name to released from schedule to adhere to nsi2 spec
wrap release in try/except so we can log errors (and actually figure out what is going on)
fix release and releaseConfirmed to aggregator
fix error event in aggregator so it adheres to new api
always generate data plane change notification in aggregator (leave emit decision to higher-level)