Set reverse proxy servername via certs

The certs class already has the correct servername (set via init.pp) so
this avoids a mismatch. It also adds aliases via the CNAME, which is new
functionality.

manifests/init.pp

@@ -219,7 +219,6 @@
     ~> class { 'foreman_proxy_content::reverse_proxy':
       path         => '/',
       url          => "${foreman_url}/",
-      servername   => $foreman_proxy_fqdn,
       port         => $reverse_proxy_port,
       subscribe    => Class['certs::foreman_proxy'],
       ssl_protocol => $ssl_protocol,

manifests/reverse_proxy.pp

@@ -4,8 +4,6 @@
 #   The path where to mount the reverse proxy
 # @param url
 #   The URL to forward to
-# @param servername
-#   The Apache vhost server name to listen on
 # @param port
 #   The port to listen on
 # @param ssl_protocol
@@ -17,7 +15,6 @@
 class foreman_proxy_content::reverse_proxy (
   Stdlib::Unixpath $path = '/',
   Stdlib::Httpurl $url = "${foreman_proxy_content::foreman_url}/",
-  Stdlib::Fqdn $servername = $foreman_proxy_content::foreman_proxy_fqdn,
   Stdlib::Port $port = $foreman_proxy_content::reverse_proxy_port,
   Variant[Array[String], String, Undef] $ssl_protocol = undef,
   Hash[String, Any] $vhost_params = {},
@@ -30,7 +27,8 @@
   Class['certs', 'certs::ca', 'certs::apache', 'certs::foreman_proxy'] ~> Class['apache::service']
 
   apache::vhost { 'katello-reverse-proxy':
-    servername             => $servername,
+    servername             => $certs::apache::hostname,
+    aliases                => $certs::apache::cname,
     port                   => $port,
     docroot                => '/var/www/',
     priority               => '28',