Consolidate gogo/protobuf dependencies under our own protobuf package

This would make gogo/protobuf migration easier.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

runtime/v1/shim/local.go

@@ -24,8 +24,8 @@ import (
 	"path/filepath"
 
 	"github.com/containerd/containerd/mount"
+	ptypes "github.com/containerd/containerd/protobuf/types"
 	shimapi "github.com/containerd/containerd/runtime/v1/shim/v1"
-	ptypes "github.com/gogo/protobuf/types"
 )
 
 // NewLocal returns a shim client implementation for issue commands to a shim