minor mqtt conf adaption

mqtt/config_templates/protected/mosquitto.conf

@@ -5,6 +5,7 @@ persistence_location /mosquitto/data/
 ## Authentication ##
 # Create passwd file:       mosquitto_passwd -c /mosquitto/config/passwd <user_name>
 # You need to make down && make up to use the new passwd file
+allow_anonymous false
 password_file /mosquitto/config/passwd
 
 ## Logging - possibilities: error, warning, notice, information, all