restart the OH2 service and check logs (both OH and Mosquitto) to see if there are any errors in establishing the connection between OH2 MQTTv1 binding and the Mosquitto Broker.
In openhab.log you should see:
2018-11-12 11:00:37.576 [INFO ] [penhab.io.transport.mqtt.MqttService] - MQTT Service initialization completed.
2018-11-12 11:00:37.577 [INFO ] [t.mqtt.internal.MqttBrokerConnection] - Starting MQTT broker connection 'mosquitto'
Ps: Use Code Fences to post configs. See here how: How to use code fences