Default action information about a particular policy statement.
When tRPAdminPolicyStatementDefaultAction for the policy statement
is accept(1), and no poliy statement entry matches the route,
the following default actions are applied to the route.
When tRPAdminPolicyStatementDefaultAction is reject, these
objects are ignored, and the route is dropped.
Entries are created when a policy statement is created.
Entries are deleted when a policy statement is destroyed.