enavle mod_include Apache module

manifests/init.pp

@@ -73,6 +73,9 @@ class secure_afs_request (
       ensure => $ensure,
     }
 
+    # We need the mod_include Apache module.
+    su_apache::module { 'include': ensure => present }
+
     # We need a Kerberos keytab for LDAP lookups.
     wallet { $ldap_wallet_name:
       ensure => $ensure,