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: Ib7162c07542d9c8c81ed35f931a2b91281610774
Related-Bug: #1628580
Closes-Bug: #1645474
(cherry picked from commit 3f8e5d1c54)

manifests/db/sync.pp

@@ -25,6 +25,8 @@ class sahara::db::sync(
     path        => '/usr/bin',
     user        => 'sahara',
     refreshonly => true,
+    try_sleep   => 5,
+    tries       => 10,
     logoutput   => on_failure,
   }