add installation for yum-cron

manifests/main/install.pp

@@ -9,4 +9,10 @@ class resources_cd::main::install (
   package { $reqpackages:
     ensure => $pkg_ensure,
   }
+
+  if $rs_autoupdate == true {
+    package { 'yum-cron':
+      ensure  => present,
+    }
+  }
 }