Add settings block to ssh public key in auth file, ReadMe file update

bin/remove-old-ssh-keys.sh

@@ -131,6 +131,8 @@ for line in `cat "${CONFIG_BASE}${server_list}" | sed 1d`; do
 	fi
 	# flags: (not used at the moment)
 	flags=$(echo "${line}" | cut -d "," -f 3);
+	# auth key settings (in front of auth key)
+	settings=$(echo "${line}" | cut -d "," -f 4);
 	# ssh key names
 	SSH_KEY_PUB_FILE="${hostname}_${username}.pem.pub";