prow/flagutil/bool.go
func (b *Bool) Set(s string) error {
	v, err := strconv.ParseBool(s)
	if err != nil {
		return err
	}
	b.Explicit = true
	b.Value = v
	return nil
}
func (b *Bool) Set(s string) error {
	v, err := strconv.ParseBool(s)
	if err != nil {
		return err
	}
	b.Explicit = true
	b.Value = v
	return nil
}
// Set the bool according to the string.