Temporarily vendoring tip of the release-1.x branch, to address
docker context inspect being slow on Windows because this package
performs user lookup through `os.Current()` during `init()`.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 466c50f939)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>