The HostDenied field is renamed to ssh. To preserve existing data,
# cd /var/lib/munin/example.net
# mv hostname-hostsdeny-HostsDenied-g.rrd hostname-hostsdeny-sshd-g.rrd
This refactor incidentally also fixes a bug where empty or commented-out
lines where also counted.
Signed-off-by: Olivier Mehani <shtrom@ssji.net>