xtrabackup use ensure_packages, so other modules play nicely

Author: edestecd

manifests/backup/xtrabackup.pp

@@ -29,9 +29,7 @@
   $additional_cron_args    = ''
 ) inherits mysql::params {
 
-  package{ $xtrabackup_package_name:
-    ensure  => $ensure,
-  }
+  ensure_packages($xtrabackup_package_name)
 
   if $backupuser and $backuppassword {
     mysql_user { "${backupuser}@localhost":