[1073201] revision due to regression
When updating plugin config we added an optimization to root the ensuing
service discovery at the resource being updated, as opposed to doing a
full service scan.  The regression resulted from passing the attached
Resource to the agent.  Never pass attached objects to the agent from
the server.  Unfortunately, detaching the object was not viable as it
actually needed to stay attached for the overall logic flow. So, I
lightened the API to just require the resourceId, which is a better agent
API anyway.