Code review comment for lp:~alextu/lxc-android-config/lp1575564_include_rules_in_device_tarball

@Jamie, /system is the mount path for loopback image /var/lib/lxc/android/system.img, so everything inside the folder will be hidden by the image itself unless somehow it gets re-configured after system.img being mounted. That sounds we're going to introduce another timing dependency or something even ugly/worse. Is there any other way to ignore non-existent folder for apparmor itself? Documentation says these config files are preprocessed by cpp, and there doesn't seem to have a known switch to turning off such error reporting.