This package will not be included in the api or client modules, and
we're currently only using a single function of it, and only the
unix implementation, so let's fork it for now (although the package
may be moved to moby/sys).
This removes the last dependency on github.com/docker/docker.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2abcbf842f