lxc-busybox: don't copy temp mounts into mtab

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

templates/lxc-busybox.in

@@ -196,7 +196,7 @@ configure_busybox()
     cat <<EOF >$CHPASSWD_FILE
 echo "setting root password to \"root\""
 
-mount --bind /lib $rootfs/lib
+mount -n --bind /lib $rootfs/lib
 if [ \$? -ne 0 ]; then
     echo "Failed bind-mounting /lib at $rootfs/lib"
     exit 1