nagios: turns out this newline is important syntax wise

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/nagios_server/templates/nagios/hostgroups/all-external.cfg.j2

@@ -23,6 +23,7 @@ define hostgroup {
         hostgroup_name proxies_ocp4
         alias          OCP Web Servers
         members         {% for host in groups["proxies_ocp4"]|sort %} {{ hostvars[host]["inventory_hostname_short"] }}.fedoraproject.org {% if not loop.last %}, {% endif %} {% endfor %}
+
 }
 
 {% for key, value in groups.items()|sort %}