UPSTREAM: <carry>: Bug 1893156: include / prefix in instance ID output

When we want to read an instance ID from the metadata service, cloud provider
doesn't include "/" prefix, which is required for successful parsing of
provider the ID later.
This commit adds the missing "/" prefix to the output.

Cherry-picked from openshift/kubernetes#343

Origin-commit: 65347c66667fe6f29819b65693221d3de56e9caa

Kubernetes-commit: eb7342883d232a9876390a0eab4344894a05b81c

openstack/openstack_instances.go

@@ -221,7 +221,7 @@ func (i *Instances) InstanceID(ctx context.Context, name types.NodeName) (string
 	}
 	localName := types.NodeName(md.Name)
 	if localName == name {
-		return md.UUID, nil
+		return "/" + md.UUID, nil
 	}
 
 	srv, err := getServerByName(i.compute, name)