destroy a resource doesn't destroy the SubscriptionManager resource

["Vinh Nguyen (vinguye2)" <vi...@cisco.com>]

When I create a resource, do a Subscribe, and then destroy the original
resource, I am finding that this does not destroy the other child
resources spawned off of it, like the SubscriptionManager resource.  Is
this the intended functionality?
 
I'd like to have all child resources destroyed automatically if the
parent resource is destroyed.  Otherwise, the application will bomb due
to dangling child resource objects that are still alive but unused.