nagios: change the string checked on the status page

Nagios warns us if status.fp.o isn't running, that's the goal.
But nagios was checking for the presence of the string:
"All systems go".
This is fine, until one system goes down. Nagios tells us about
this system, we go look at it, we (manually) update status.fp.o
so our users know that we know about the outage.
Then nagios tells us that status.fp.o isn't how it should be and
we need to go tell nagios that we know status isn't how it should
be since we updated it ourselves.

So instead of checking for "All systems go" we'll now check for
"Fedora Infrastructure Status" which is at the top of the page
and will remain there as long as status.fp.o is up and regardless
of the state of the rest of the infra.

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

roles/nagios_server/templates/nagios/services/websites.cfg.j2

@@ -135,7 +135,7 @@ define service {
 define service {
   host_name             status
   service_description   http-status.fedoraproject.org
-  check_command         check_website_ssl!www.fedorastatus.org!/index.html!All systems go
+  check_command         check_website_ssl!www.fedorastatus.org!/index.html!Fedora Infrastructure Status
   use                   websitetemplate
 }