After copying allowed device nodes, set up "/dev/fd", "/dev/stdin", "/dev/stdout", and "/dev/stderr" symlinks. Docker-DCO-1.1-Signed-off-by: Bernerd Schaefer <bj.schaefer@gmail.com> (github: bernerdschaefer) [rebased by @crosbymichael] Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael) Upstream-commit: 2bc34036b9106318f8564ee36b696ad070b02573 Component: engine