manifests: update cluster.k8s.io object name to cluster_id
manifests: update cluster.k8s.io object name to cluster_id

The machine-api requires that all machine objects reference back to cluster object as specified by `sigs.k8s.io/cluster-api-cluster` label
on the machine objects to make sure masters are correctly adopted.

derekhiggins/installer,derekhiggins/installer