Remove load image support

Signed-off-by: Lantao Liu <lantaol@google.com>

cmd/ctr/main.go

@@ -1,41 +0,0 @@
-/*
-Copyright 2018 The containerd 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 main
-
-import (
-	"fmt"
-	"math/rand"
-	"os"
-	"time"
-
-	ctrapp "github.com/containerd/containerd/cmd/ctr/app"
-
-	cricli "github.com/containerd/cri/cli"
-)
-
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
-func main() {
-	app := ctrapp.New()
-	app.Commands = append(app.Commands, cricli.Command)
-	if err := app.Run(os.Args); err != nil {
-		fmt.Fprintf(os.Stderr, "ctr: %s\n", err)
-		os.Exit(1)
-	}
-}