Use osfamily fact instead of operatingsystem.

The operatingsystem fact is used across the whole module.
Ensure this applies and switch from operatingsystem fact
to osfamily where needed.

manifests/loadbalancer.pp

@@ -454,7 +454,7 @@ class cloud::loadbalancer(
     options      => $heat_cloudwatch_options
   }
 
-  if $::operatingsystem == 'RedHat' {
+  if $::osfamily == 'RedHat' {
     $horizon_auth_url = 'dashboard'
   } else {
     $horizon_auth_url = 'horizon'