Merge branch 'backport/stop_in_wait_reconnect_idf4x' into 'idf_v4.x'

Backport Moves state change when stopping the client

See merge request espressif/esp-mqtt!151

mqtt_client.c

@@ -1571,6 +1571,7 @@ static void esp_mqtt_task(void *pv)
     esp_transport_close(client->transport);
     outbox_delete_all_items(client->outbox);
     xEventGroupSetBits(client->status_bits, STOPPED_BIT);
+    client->state = MQTT_STATE_DISCONNECTED;
 
     vTaskDelete(NULL);
 }