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Design changes [1] from the Dublin PTG prompted some rewording of the docstring for ComputeDriver.update_provider_tree. And to avoid that docstring becoming too enormous, relevant chunks of the spec [2] are copied to a new devref document which is linked from that docstring. [1] https://review.openstack.org/#/c/552122/ [2] http://specs.openstack.org/openstack/nova-specs/specs/rocky/approved/update-provider-tree.html Change-Id: I06504aa2a3fe6d39ecc1e681de43be8fee9e06f6 blueprint: update-provider-tree