Parsing annotation should not return partial results

[YifeiZhuang]

Parsing annotation should not return partial results, needs to be fixed to something like:

if err := json.Unmarshal(); err != nil { return InterfaceStatusAnnotation{}, err }
return ret, nil

gke-networking-api/apis/network/v1/annotations.go

Lines 213 to 252 in 898f6b4

	func ParseNodeNetworkAnnotation(annotation string) (NodeNetworkAnnotation, error) {
	ret := &NodeNetworkAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}
	// ParsePodIPsAnnotation parses the given annotation to PodIPsAnnotation.
	func ParsePodIPsAnnotation(annotation string) (PodIPsAnnotation, error) {
	ret := &PodIPsAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}
	// ParseMultiNetworkAnnotation parses given annotation to MultiNetworkAnnotation.
	func ParseMultiNetworkAnnotation(annotation string) (MultiNetworkAnnotation, error) {
	ret := &MultiNetworkAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}
	// ParseNorthInterfacesAnnotation parses given annotation to NorthInterfacesAnnotation.
	func ParseNorthInterfacesAnnotation(annotation string) (NorthInterfacesAnnotation, error) {
	ret := &NorthInterfacesAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}
	// ParseNICInfoAnnotation parses given annotation to NicInfoAnnotation
	func ParseNICInfoAnnotation(annotation string) (NICInfoAnnotation, error) {
	ret := &NICInfoAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}
	// ParseInterfaceStatusAnnotation parses the given annotation to InterfaceStatusAnnotation
	func ParseInterfaceStatusAnnotation(annotation string) (InterfaceStatusAnnotation, error) {
	ret := &InterfaceStatusAnnotation{}
	err := json.Unmarshal([]byte(annotation), ret)
	return *ret, err
	}

[YifeiZhuang]

/assign @liuyuan10