docker-containerd: bump to v1.1.3

docker-containerd: bump to v1.1.3

This commit bumps docker-containerd to v1.1.3.

This is a requisite bump for the upgrade of docker-engine to 2018.06.

The license file was renamed from LICENSE.code to LICENSE, so we take
this opportunity to add the hash for the license file. The only change
between LICENSE.code and LICENSE is:

-   Copyright 2013-2016 Docker, Inc.
+   Copyright The containerd Authors

Signed-off-by: Christian Stewart <christian@paral.in>
[Thomas: fix legal info, add hash for license file.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>