Construct foreman_url from servername and drop parameter

Drops the foreman_url parameter and constructs it from the servername
given to Apache. The foreman_url and servername should match
and this gives one less parameter that needs to be configured to get
a correct installation.

manifests/init.pp

@@ -48,8 +48,6 @@
 #
 # === Advanced parameters:
 #
-# $foreman_url::                  URL on which foreman is going to run
-#
 # $unattended::                   Should Foreman manage host provisioning as well
 #
 # $unattended_url::               URL hosts will retrieve templates from during build (normally http as many installers don't support https)
@@ -193,7 +191,6 @@
 # $keycloak_realm::               The realm as passed to keycloak-httpd-client-install
 #
 class foreman (
-  Stdlib::HTTPUrl $foreman_url = $foreman::params::foreman_url,
   Boolean $unattended = $foreman::params::unattended,
   Optional[Stdlib::HTTPUrl] $unattended_url = $foreman::params::unattended_url,
   Boolean $apache = $foreman::params::apache,
@@ -296,6 +293,8 @@
     timeout => 0,
   }
 
+  $foreman_url = "https://${foreman::servername}"
+
   include foreman::install
   include foreman::config
   include foreman::database