Added retries for db_sync

If db sync fails, it is never retried leading to errors. So, this
patch adds retries for db_sync to avoid sync fails.

Change-Id: Id89665099079ab5e4c468f7f30953762a248af01
Closes-Bug: #1628580

manifests/db/sync.pp

@@ -6,6 +6,8 @@ class zaqar::db::sync {
     path        => '/usr/bin',
     user        => 'zaqar',
     refreshonly => true,
+    try_sleep   => 5,
+    tries       => 10,
     subscribe   => [Package['zaqar'], Zaqar_config['database/connection']],
   }