[nova][ptg] Resource provider delete at service delete

Bal√°zs Gibizer balazs.gibizer at est.tech
Sun Nov 10 08:09:18 UTC 2019

ML thread: 

Agreements in the room:

* Check ongoing migration and reject the delete if migration with this
  compute having the source node exists. Let operator confirm the 
* Cascade delete providers and allocations in placement.
  * in case of evacuated instances this is the right thing to do
  * in any other dangling allocation case nova has the final thrut so 
    has the authority to delete them.
* Document possible ways to reconcile Placement with Nova using
  heal_allocations and eventually the audit command once it's merged.


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