Comment 22 for bug 1444402

I got http://cgit.freedesktop.org/systemd/systemd/commit/?id=2005219 upstream, which is about as far as they want to go. It's not a supported configuration to have a r/w /sys in a container and run udev. This can't work. So if you want to manually unmount bind mounts (the second patch), please drop the r/w mounting of sys.