Upgrade openapi generator to v5.1.0

Upgraded openapi generator version to 5.1.0 for the support of nullable
values for optional fields; Added missing "Disabled" enum value to the
BootSourceOverrideEnabled model in the openapi schema.

Signed-off-by: James Gu <james.gu@att.com>
Change-Id: Ia3e0b018be13079d2085ef61ed2e797bcfd25fd7

client/model_transfer_method.go

@@ -4,10 +4,17 @@
  * Partial Redfish OAPI specification for a limited client
  *
  * API version: 0.0.1
- * Generated by: OpenAPI Generator (https://openapi-generator.tech)
  */
 
+// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.
+
 package client
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
 // TransferMethod the model 'TransferMethod'
 type TransferMethod string
 
@@ -16,3 +23,62 @@ const (
 	TRANSFERMETHOD_STREAM TransferMethod = "Stream"
 	TRANSFERMETHOD_UPLOAD TransferMethod = "Upload"
 )
+
+func (v *TransferMethod) UnmarshalJSON(src []byte) error {
+	var value string
+	err := json.Unmarshal(src, &value)
+	if err != nil {
+		return err
+	}
+	enumTypeValue := TransferMethod(value)
+	for _, existing := range []TransferMethod{ "Stream", "Upload",   } {
+		if existing == enumTypeValue {
+			*v = enumTypeValue
+			return nil
+		}
+	}
+
+	return fmt.Errorf("%+v is not a valid TransferMethod", value)
+}
+
+// Ptr returns reference to TransferMethod value
+func (v TransferMethod) Ptr() *TransferMethod {
+	return &v
+}
+
+type NullableTransferMethod struct {
+	value *TransferMethod
+	isSet bool
+}
+
+func (v NullableTransferMethod) Get() *TransferMethod {
+	return v.value
+}
+
+func (v *NullableTransferMethod) Set(val *TransferMethod) {
+	v.value = val
+	v.isSet = true
+}
+
+func (v NullableTransferMethod) IsSet() bool {
+	return v.isSet
+}
+
+func (v *NullableTransferMethod) Unset() {
+	v.value = nil
+	v.isSet = false
+}
+
+func NewNullableTransferMethod(val *TransferMethod) *NullableTransferMethod {
+	return &NullableTransferMethod{value: val, isSet: true}
+}
+
+func (v NullableTransferMethod) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.value)
+}
+
+func (v *NullableTransferMethod) UnmarshalJSON(src []byte) error {
+	v.isSet = true
+	return json.Unmarshal(src, &v.value)
+}
+