Fix post-upgrade init scripts cleanup
In 8166dc04, we tried to cleanup some init scripts that were moved (in 4cd13826 and 6dc87710).
Unfortunately, during an upgrade from version OLD to version NEW, S11upgrade
from version OLD is executed (it copies the new root filesystem and reboots), thus this cleanup is only executed in S11upgrade
from version NEW during the first boot of version NEW. Which means that is the init scripts before S11upgrade
are messed up, the system will never boot up to S11upgrade
and thus will never have the opportunity to clean itself up