Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/docker/docker/pkg/system/umask.go

@@ -1,13 +0,0 @@
-// +build !windows
-
-package system
-
-import (
-	"syscall"
-)
-
-// Umask sets current process's file mode creation mask to newmask
-// and return oldmask.
-func Umask(newmask int) (oldmask int, err error) {
-	return syscall.Umask(newmask), nil
-}