Commit 61e0295d by Josh Kunz

Adds destructors to cleanup unreferenced capabilities

When the python object associated with a given capability is garbage collected
(i.e. there are no more references to it), the object will call capnet
to delete the associated capability. Except for flows. Often times,
flows should persist, even after python-level references are lost. They
must be manually managed.
parent cb71a476
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