IN PROGRESS - issue CORE-4518: System Message - Status success is
returned even when the date is wrong and message is not generated 
https://pods.iplantcollaborative.org/jira/browse/CORE-4518

When the deactivation date is in the past or when the activation date is
after the deactivation date, the NotificationAgent's PUT /admin/system
endpoint will respond with a failure.