Move cri server packages under pkg/cri

Organizes the cri related server packages under pkg/cri

Signed-off-by: Derek McGowan <derek@mcg.dev>

pkg/cri/server/image_list.go

@@ -0,0 +1,38 @@
+/*
+   Copyright 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 server
+
+import (
+	"golang.org/x/net/context"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
+)
+
+// ListImages lists existing images.
+// TODO(random-liu): Add image list filters after CRI defines this more clear, and kubelet
+// actually needs it.
+func (c *criService) ListImages(ctx context.Context, r *runtime.ListImagesRequest) (*runtime.ListImagesResponse, error) {
+	imagesInStore := c.imageStore.List()
+
+	var images []*runtime.Image
+	for _, image := range imagesInStore {
+		// TODO(random-liu): [P0] Make sure corresponding snapshot exists. What if snapshot
+		// doesn't exist?
+		images = append(images, toCRIImage(image))
+	}
+
+	return &runtime.ListImagesResponse{Images: images}, nil
+}