MM: Use the new api interface for Nagios checks

The newly introduced api interface provides a way to query the MM
frontend for availability which only performs a minimal database query.
Using this interface should reduce the load on the frontend and the
database.

roles/nagios_server/files/nagios/services/websites.cfg

@@ -46,7 +46,7 @@ define service {
 define service {
   host_name             mm-frontend01,mm-frontend01.stg
   service_description   mm-publiclist-internal
-  check_command         check_website!localhost!/mirrormanager/
+  check_command         check_website!localhost!/mirrormanager/api/mirroradmins/?name=dl.fedoraproject.org
   use                   internalwebsitetemplate
 }