el_script: Optimize serial console if requested

Author: deajan

el_configurator.sh

@@ -1939,6 +1939,9 @@ if [ "${CONFIGURE_SERIAL_TERMINAL}" != false ]; then
     else
         log_quit "Cannot setup serial console on this system"
     fi
+
+    log "Optimizing for serial console speed"
+    set_conf_value /etc/ssh/sshd_config.d/99-el_configurator.conf "kernel.printk" "4 4 1 7" " "
 fi
 
 if [ "${CONFIGURE_TERMINAL_RESIZER}" != false ]; then