sysklogd: various fixes so it starts/stops cleanly
This patch fixes several issues with the sysklogd recipe:
o Errors at start due to non-existent /var/log/news/ - every other log
file is created in /var/log, not a sub-directory. Do the same for news
logs.
o klogd would not be stopped due to pidfile recycling, give klogd its own
pidfile
o preinstalls failed at rootfs creation time by trying to access the host
root filesystem rather than a path relative to $D. Update the preinst to
test for $D and do the right thing.
