Ensure that motd gets locked down

src/freedombone-utils-setup

         chmod -R 600 /etc/letsencrypt
         chmod -R g=rX /etc/letsencrypt
     fi
+    chown -f root:root /etc/motd /etc/issue*
+    chmod -f 0444 /etc/motd /etc/issue*
 }
 
 function disable_core_dumps {