Revert DeepCopy to use un/marshal (istio#327)

* Revert DeepCopy to use un/marshal

* Lint

pkg/apis/istio/v1alpha2/deepcopy.go

@@ -18,11 +18,21 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	"istio.io/operator/pkg/util"
+	"istio.io/pkg/log"
 )
 
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
-func (in *IstioControlPlane) DeepCopyInto(out *IstioControlPlane) {
-	*out = *proto.Clone(in).(*IstioControlPlane)
+func (in *IstioControlPlane) DeepCopyInto(out proto.Message) {
+	inj, err := util.MarshalWithJSONPB(in)
+	if err != nil {
+		log.Error(err.Error())
+		return
+	}
+	if err := util.UnmarshalWithJSONPB(inj, out); err != nil {
+		log.Error(err.Error())
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new IstioControlPlane.