remove the lower file limit as we have lots of hosts and services needing open files

roles/fedmsg/hub/templates/fedmsg-hub-systemd.conf.j2

@@ -13,6 +13,8 @@ LimitAS={{ (fedmsg_hub_memory_limit_mb|int + (ansible_memory_mb.swap.total / 2))
 {% endif %}
 {% endif %}
 
+LimitNOFILE=16384
+
 {% if fedmsg_hub_auto_restart %}
 Restart=on-failure
 {% if env == 'staging' %}