Integration test two apps

Use localhost for app_with_roles and 127.0.0.1 for app. Confirm we can
deploy both and the respond to requests. Ensure the proxy is removed
once both have been removed.

test/integration/docker/load_balancer/default.conf

@@ -8,6 +8,8 @@ server {
 
   location / {
     proxy_pass http://loadbalancer;
+    proxy_set_header Host $host;
+
     proxy_connect_timeout       10;
     proxy_send_timeout          10;
     proxy_read_timeout          10;