A suggestion for an addition to iptables install in BLFS

I found the console to be not very usable due to all the iptables messages
flooding it when the firewall is set up.
With systemd you can set up a file to change the default message level from 4
to 3 to clean this up.

lfs [ /etc/sysctl.d ]$ cat printk.conf
kernel.printk = 4 3 1 7

lfs [ ~ ]$  cat /proc/sys/kernel/printk
4	3	1	7

The second digit defaults to 4.  Changing it to 3 clears up the console and
the messages still go to journalctl and dmesg.  An alternative method might be
to add:

 echo "4 3 1 7" > /proc/sys/kernel/printk

to the iptables configuration script.

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