vsphere/host_port_group_structure.go
func portGroupIDsFromResourceID(d *schema.ResourceData) (string, string, error) {
	return splitHostPortGroupID(d.Id())
}
func portGroupIDsFromResourceID(d *schema.ResourceData) (string, string, error) {
	return splitHostPortGroupID(d.Id())
}
// portGroupIDsFromResourceID passes a resource's ID through
// splitHostPortGroupID.