sysklogd: various fixes so it starts/stops cleanly

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.

Signed-off-by: Joshua Lock <josh@linux.intel.com>