Since the moby/moby can't handle duplicate exit event well, it's hard
for containerd to retry shutdown if there is error, like context
canceled.
In order to prevent from regression like #4769, I add skipped
integration case as TODO item and we should rethink about how to handle
the task/shim lifecycle.
Signed-off-by: Wei Fu <fuweid89@gmail.com>
601699a184