only stopped process or failed process allow run start 是不是应该在loadFirst判断，而不是restart

[BillXiang]

client/cmd/exec/restart.go

func restart(m *model.Process, flags string) ([]string, error) {
	// only stopped process or failed process allow run start
	if m.Status == model.StatusStopped || m.Status == model.StatusFailed {
		newData, err := reloadProcess(m, flags)
		if err != nil {
			return nil, err
		}

		return newData, nil
	}

	return nil, fmt.Errorf("the process already start")
}