Clean up unnecessary workaround related to puppetlabs-apache

Since v5.6.0, mod_packages[1] and mod_libs[2] are automatically set
to the appropriate value in CentOS8, so we don't need to set these
parameters explicitly.

[1] https://github.com/puppetlabs/puppetlabs-apache/commit/d346b76d1
[2] https://github.com/puppetlabs/puppetlabs-apache/commit/f31e392a6

Change-Id: Iab5964f54d0e5de0538e02b59ec5be0cdcf926d5

manifests/apache.pp

@@ -4,23 +4,13 @@ class openstack_integration::apache {
   include openstack_integration::config
 
   if ($::os['family'] == 'Debian') {
-    $wsgi_mod_package = 'libapache2-mod-wsgi-py3'
-    $wsgi_mod_lib     = 'mod_wsgi.so'
-  }
-  elsif ($::os['name'] == 'Fedora') or
-    ($::os['family'] == 'RedHat' and Integer.new($::os['release']['major']) > 7) {
-    $wsgi_mod_package = 'python3-mod_wsgi'
-    $wsgi_mod_lib     = 'mod_wsgi_python3.so'
-  }
-  if ($::os['family'] == 'Debian') or ($::os['name'] == 'Fedora') or
-    ($::os['family'] == 'RedHat' and Integer.new($::os['release']['major']) > 7) {
     include apache::params
     class { 'apache':
       mod_packages => merge($::apache::params::mod_packages, {
-        'wsgi' => $wsgi_mod_package,
+        'wsgi' => 'libapache2-mod-wsgi-py3',
       }),
       mod_libs     => merge($::apache::params::mod_libs, {
-        'wsgi' => $wsgi_mod_lib,
+        'wsgi' => 'mod_wsgi.so',
       })
     }
   }