Integrate NATS with event subsystem

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

execution/executors/oci/oci.go

@@ -12,7 +12,9 @@ import (
 	"github.com/docker/containerd/execution"
 )
 
-var ErrRootEmpty = errors.New("oci: runtime root cannot be an empty string")
+var (
+	ErrRootEmpty = errors.New("oci: runtime root cannot be an empty string")
+)
 
 func New(root string) (*OCIRuntime, error) {
 	err := SetSubreaper(1)