[FAB-13727] Clone v1.3 builtin validation plugin

New lifecycle will require the builtin validation plugin to behave differently
in several crucial ways. As opposed to inlining capability checks, we simply
clone the component, leave the old one unmodified and only change the new
one.

Change-Id: Ieabce14668c4d733eff86dff5b69c4988df4690d
Signed-off-by: Alessandro Sorniotti <ale.linux@sopit.net>

Author: ale-linux

core/handlers/validation/builtin/default_validation.go

@@ -19,6 +19,7 @@ import (
 	. "github.com/hyperledger/fabric/core/handlers/validation/api/state"
 	"github.com/hyperledger/fabric/core/handlers/validation/builtin/v12"
 	"github.com/hyperledger/fabric/core/handlers/validation/builtin/v13"
+	"github.com/hyperledger/fabric/core/handlers/validation/builtin/v20"
 	"github.com/hyperledger/fabric/protos/common"
 	"github.com/pkg/errors"
 )
@@ -36,6 +37,7 @@ type DefaultValidation struct {
 	Capabilities    Capabilities
 	TxValidatorV1_2 TransactionValidator
 	TxValidatorV1_3 TransactionValidator
+	TxValidatorV2_0 TransactionValidator
 }
 
 //go:generate mockery -dir . -name TransactionValidator -case underscore -output mocks/
@@ -65,7 +67,8 @@ func (v *DefaultValidation) Validate(block *common.Block, namespace string, txPo
 	var err error
 	switch {
 	case v.Capabilities.V2_0Validation():
-		fallthrough
+		err = v.TxValidatorV2_0.Validate(block, namespace, txPosition, actionPosition, serializedPolicy.Bytes())
+
 	case v.Capabilities.V1_3Validation():
 		err = v.TxValidatorV1_3.Validate(block, namespace, txPosition, actionPosition, serializedPolicy.Bytes())
 
@@ -133,6 +136,7 @@ func (v *DefaultValidation) Init(dependencies ...validation.Dependency) error {
 	v.Capabilities = c
 	v.TxValidatorV1_2 = v12.New(c, sf, d, pe)
 	v.TxValidatorV1_3 = v13.New(c, sf, d, pe)
+	v.TxValidatorV2_0 = v20.New(c, sf, d, pe)
 
 	return nil
 }