Make use of SSH pipelining

Make sure to read http://docs.ansible.com/ansible/intro_configuration.html#pipelining

I've had no issues with this so far, not on Amazon machines, not on recent Ubuntu and Debian

.infra/Freyfile.hcl

@@ -12,6 +12,9 @@ global {
       host_key_checking = false
       ansible_managed = "Ansible managed"
     }
+    ssh_connection {
+      pipelining = true
+    }
   }
 }