drop staging limit

Change-Id: I3d0595a4d2c900c0369e074a4a9b87f717c67d41
diff --git a/hosts b/hosts
index ab8b4c9..5c10d65 100644
--- a/hosts
+++ b/hosts
@@ -5,6 +5,6 @@
   cloud_name: x86_64-TF-02
   docker_url: tcp://51.159.20.54:2375
   host_credentials_id: docker-access
-  max_containers: 40
+  max_containers: 30
   docker_templates: !include docker_templates_amd64.yml