Description of problem: BMH resources are marked as detached once the deployment completes. Currently, BMAC takes care of re-attaching the BMH when an ISO is regenerated. This will cause a node re-deployment for every BMH associated to the InfraEnv that an image has been regenerated for, including installed nodes. As far as assisted service is concerned, an installed spoke cluster is not part of the hub cluster anymore. Therefore, BMAC should respect this principle and skip reconcile for BMH nodes that have been detached.