Add unionfs-fuse to system.fsPackages if needed
nslcd: Start after network.target (but don't require network)
openldap: Adjust to systemd
unionfs-fuse: Fix conditional expressions
nixos-install: Bind-mount efivars if it exists

Signed-off-by: Shea Levy <shea@shealevy.com>
nixos-install: Unmount efivars if mounted

Signed-off-by: Shea Levy <shea@shealevy.com>
bash-completion: support the "$out/share/bash-completion" location used by modern packages