Rework the logging daemons startup

The logging mechanism startup being in inittab, it isn't easy to
overcharge the default policy. With this patch, the startup of the
syslog daemon is moved to an init.d script, that can easily be
overwritten.

[Peter: use install -D]
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>