Comment 9 for bug 1522444

Sending of a DELETE request for a node runs node_deletion task and this blocks a batch node deletion on UI (DELETE for the second node will return 500 because of not completed previous node_deletion task).

So, we still need to think about the way to delete provisioned nodes. The deletion flow of deployed nodes (pending deletion node flag and redeployment) is not suitable for provisioned nodes too, because it can be the case, that we need to deploy some controller to delete another provisioned node from the environment (at least 1 controller is required to deploy environment changes).