Comment 1 for bug 1423952

This was actually 'fixed' with bug 1308342 in that you can do a force-delete call on the instance and that will clean it up. However, the fix for bug 1308342 introduced a regression in the cells RPC API, so we have bug 1430822 to fix that.

Once we revert https://review.openstack.org/#/c/121800/ then we'll make the fix for this in the compute API to allow force-delete of an instance stuck in 'deleting' task_state to resolve this bug.

Note that we should also have a @revert_task_state decorator in whatever compute manager call failed on spawn so we don't get stuck in this state to begin with.