Merge pull request #1442 from synyx/mod_prefork_as_prequisite_of_mpm_itk

dont fail if mpm_module is itk and class apache::mod::prefork is not defined

manifests/mod/itk.pp

@@ -25,7 +25,7 @@
       }
     } else {
       if ! defined(Class['apache::mod::prefork']) {
-        fail('apache::mod::prefork is a prerequisite for apache::mod::itk, please arrange for it to be included.')
+        include ::apache::mod::prefork
       }
     }
   }