Je confirme que ce fichier n'est pas exécuté.
Je viens donc de laisser un nouveau message sur le rapport de bug cité par DiEOrLivE dans le premier post, à savoir :
https://bugzilla.redhat.com/show_bug.cgi?id=734268
avec :
When file /etc/rc.local is missing or is not executable, service rc-local fails to start at startup. File /etc/rc.d/rc.local does not seem to be looked at. On the other hand, when /etc/rc.local exists and is executable, service rc-local seems to have no problem at startup (no error message), however the commands it contains are not executed ! (tested with simple commands such as touch file or echo "test" > file)
A suivre, donc...