Comment 2 for bug 1690425

This specific proposal is not suggesting to introduce a first-class cell concept in Neutron, but rather make sure that Neutron be aware of the nova cells where the compute workload affected by networking events actually run. This has the benefit of spreading control messages over the DB/MQ clusters rather than overloading a single 'central' MQ/DB as it happens today. For this reason, I suspect that there is no need for a neutron cell abstraction per se (and thus no concern about mapping of scopes), at least in the first iteration of this effort, but I think we should be at least open to the idea in case we're missing other important use cases.