Limit number of demo devices (#321)

We currently only need switches for the acceptance tests, so don't provision any access points or gateways.

docker-compose.yaml

@@ -5,6 +5,8 @@ services:
     init: true
     restart: "always"
     user: "unifi"
+    environment:
+      UNIFI_STDOUT: "true"
     ports:
       - "${UNIFI_HTTP_PORT:-8080}:8080/tcp"
       - "${UNIFI_HTTPS_PORT:-8443}:8443/tcp"