AddOCIHook adds oci.Hook of the given hook name to spec.

NewOCIHook creates a new oci.Hook with given parameters.

CreateRuntime commands MUST be called as part of the create operation after the runtime environment has been created but before the pivot_root has been executed.

Prestart commands are executed after the container namespaces are created, but before the user supplied command is executed from init.

Note: The below type definition as well as constants have been copied from https://github.com/opencontainers/runc/blob/master/libcontainer/configs/config.go.