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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I likely need to write a functional test to recreate this first to see
how things fail.

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Also affects: nova/stein
   Importance: Undecided
       Status: New

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1823370

Title:
  Evacuations are not restricted to the source cell during scheduling

Status in OpenStack Compute (nova):
  New
Status in OpenStack Compute (nova) pike series:
  New
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New
Status in OpenStack Compute (nova) stein series:
  New

Bug description:
  During most move operations we restrict the request spec to the cell
  the instance is in before calling the scheduler:

  unshelve:
  https://github.com/openstack/nova/blob/a6963fa6858289d048e4d27ce8e61637cd023f4c/nova/conductor/manager.py#L822

  cold migrate:
  https://github.com/openstack/nova/blob/a6963fa6858289d048e4d27ce8e61637cd023f4c/nova/conductor/tasks/migrate.py#L163

  live migrate:
  https://github.com/openstack/nova/blob/a6963fa6858289d048e4d27ce8e61637cd023f4c/nova/conductor/tasks/live_migrate.py#L354

  But for some reason we don't do that during evacuate (or rebuild to
  the same host with forced hosts/nodes when the image changes - which
  in that rebuild case means the scheduler is getting nodes from all
  cells just to find the one we are forcing):

  https://github.com/openstack/nova/blob/a6963fa6858289d048e4d27ce8e61637cd023f4c/nova/conductor/manager.py#L1011

  I'm not sure how this would fail, but if the scheduler did pick a host
  in another cell things would surely fail because evacuate won't work
  across cells (the instance data is in the source cell db).

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