启动加载yaml配置文件，role、type字段支持类型判断

[mark1995]

func (t *DataSourceType) UnmarshalText(text []byte) error {
	if t == nil {
		return errors.New("can't unmarshal a nil *DataSourceRole")
	}
	if t.unmarshalText(bytes.ToLower(text)) {
		return fmt.Errorf("unrecognized protocal type: %q", text)
	}
	return nil
}

What happened:
支持的角色类型、协议类型，返回了error的错误
What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

if t.unmarshalText(bytes.ToLower(text)) {
		return fmt.Errorf("unrecognized protocal type: %q", text)
	}

改为

if !t.unmarshalText(bytes.ToLower(text)) {
		return fmt.Errorf("unrecognized protocal type: %q", text)
	}

Anything else we need to know?:

[dk-lockdown]

提个 pr 修复下哇，另外 error 的提示也有问题， DataSourceRole 提示的是 unrecognized protocal type