Comment # 2 on bug 1214968 from Natasha Ament

Hi, the message is a low level message that /etc/ cannot be unmounted. This is
because SeLinux needs /etc from pid 1 onwards. As to the message itself is
hardcoded in systemd. As it fulfills a function for other situations, a patch
to fix this is not a sensible way to proceed. As it doesn't do anything else
than showing a message it needs to be closed as a WONTFIX.