By default, exim stores its PID file in /var/spool/exim, and its log
file in /var/spool/exim/log, but it makes a lot more sense to have the
logs in /var/log/exim and the PID file in /var/run/exim.
Using binary name subdirectory in both cases allows for the use of
systemd's LogsDirectory and RuntimeDirectory statements
Signed-off-by: Pascal de Bruijn <p.debruijn@unilogic.nl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>