boskos/common/common.go
func (ud *UserData) Set(id string, in interface{}) error {
	b, err := yaml.Marshal(in)
	if err != nil {
		return err
	}
	ud.Store(id, string(b))
	return nil
}
func (ud *UserData) Set(id string, in interface{}) error {
	b, err := yaml.Marshal(in)
	if err != nil {
		return err
	}
	ud.Store(id, string(b))
	return nil
}
// User Data are used to store custom information mainly by Mason and Masonable implementation.
// Mason used a LeasedResource keys to store information about other resources that used to
// create the given resource.
// Set marshalls a struct to a string into the UserData