Fix mqtt functionality tests CI

1. Make mosquitto more verbose
  2. Sleep for 1 second in mqtt LOGIN keyword

.github/workflows/dev.yml

@@ -49,7 +49,7 @@ jobs:
 
       - name: Run function test
         run: |
-          mosquitto &
+          mosquitto -v &
           pip3 install -r ft/requirements.txt
           python3 -m robot -P ft/ --variable neuron_api:http -d ft/http_reports ft
           python3 -m robot -P ft/ --variable neuron_api:mqtt -d ft/mqtt_reports ft

ft/api_mqtt.resource

@@ -76,6 +76,7 @@ LOGIN
   _Http Node Setting                ${mqtt_node}                      ${MQTT_CONFIG}
   _Http Node Ctl                    ${mqtt_node}                      ${NODE_CTL_START}
   _Http LOGOUT
+  Sleep                             1s
 
   Connect                           ${MQTT_CONFIG_HOST}               ${MQTT_CONFIG_PORT}                     client_id=neuron-ft         clean_session=${true}
   Subscribe                         ${MQTT_CONFIG_RES_TOPIC}          qos=0                                   timeout=5