Merge pull request #13856 from ahrtr/cleanup_unused_code

The file server/storage/mvcc/util.go isn't used at all, so removing it

server/storage/mvcc/util.go

@@ -1,37 +0,0 @@
-// Copyright 2016 The etcd Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package mvcc
-
-import (
-	"fmt"
-
-	"go.etcd.io/etcd/api/v3/mvccpb"
-	"go.etcd.io/etcd/server/v3/storage/backend"
-	"go.etcd.io/etcd/server/v3/storage/schema"
-)
-
-func WriteKV(be backend.Backend, kv mvccpb.KeyValue) {
-	ibytes := newRevBytes()
-	revToBytes(revision{main: kv.ModRevision}, ibytes)
-
-	d, err := kv.Marshal()
-	if err != nil {
-		panic(fmt.Errorf("cannot marshal event: %v", err))
-	}
-
-	be.BatchTx().Lock()
-	be.BatchTx().UnsafePut(schema.Key, ibytes, d)
-	be.BatchTx().Unlock()
-}