Go mod vendor

Signed-off-by: Shengjing Zhu <zhsj@debian.org>

vendor/github.com/containerd/cgroups/Makefile

@@ -0,0 +1,24 @@
+#   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.
+
+PACKAGES=$(shell go list ./... | grep -v /vendor/)
+
+all: cgutil
+	go build -v
+
+cgutil:
+	cd cmd/cgctl && go build -v
+
+proto:
+	protobuild --quiet ${PACKAGES}