net/mosquitto: support more config fields in init script

Adds the "notifications" option which is important when connecting
mosquitto to rabbitmq for instance.

Signed-off-by: Karl Palsson <karlp@etactica.com>

net/mosquitto/files/etc/init.d/mosquitto

@@ -120,6 +120,7 @@ add_bridge() {
     config_list_foreach "$1" topic add_topic
     append_optional_bool "$1" cleansession cleansession
     append_optional_bool "$1" try_private try_private
+    append_optional_bool "$1" notifications notifications
 
     append_if "$1" clientid
     append_if "$1" identity bridge_identity