Update go fuzz to directly instantiate server

Avoid importing the cmd libraries and create the server instance
directly from the server library.

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

contrib/fuzz/builtins.go

@@ -0,0 +1,50 @@
+/*
+   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 fuzz
+
+import (
+	// base containerd imports
+	_ "github.com/containerd/containerd/diff/walking/plugin"
+	_ "github.com/containerd/containerd/events/plugin"
+	_ "github.com/containerd/containerd/gc/scheduler"
+	_ "github.com/containerd/containerd/leases/plugin"
+	_ "github.com/containerd/containerd/metadata/plugin"
+	_ "github.com/containerd/containerd/pkg/cri"
+	_ "github.com/containerd/containerd/pkg/nri/plugin"
+	_ "github.com/containerd/containerd/plugins/imageverifier"
+	_ "github.com/containerd/containerd/plugins/sandbox"
+	_ "github.com/containerd/containerd/plugins/streaming"
+	_ "github.com/containerd/containerd/plugins/transfer"
+	_ "github.com/containerd/containerd/runtime/restart/monitor"
+	_ "github.com/containerd/containerd/runtime/v2"
+	_ "github.com/containerd/containerd/services/containers"
+	_ "github.com/containerd/containerd/services/content"
+	_ "github.com/containerd/containerd/services/diff"
+	_ "github.com/containerd/containerd/services/events"
+	_ "github.com/containerd/containerd/services/healthcheck"
+	_ "github.com/containerd/containerd/services/images"
+	_ "github.com/containerd/containerd/services/introspection"
+	_ "github.com/containerd/containerd/services/leases"
+	_ "github.com/containerd/containerd/services/namespaces"
+	_ "github.com/containerd/containerd/services/opt"
+	_ "github.com/containerd/containerd/services/sandbox"
+	_ "github.com/containerd/containerd/services/snapshots"
+	_ "github.com/containerd/containerd/services/streaming"
+	_ "github.com/containerd/containerd/services/tasks"
+	_ "github.com/containerd/containerd/services/transfer"
+	_ "github.com/containerd/containerd/services/version"
+)