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: I57496bae7a13a300cdc79b22780bce0f9134ddc4
Closes-Bug: #1628580

manifests/db/sync.pp

@@ -25,6 +25,8 @@ class trove::db::sync {
     path        => '/usr/bin',
     user        => 'trove',
     refreshonly => true,
+    try_sleep   => 5,
+    tries       => 10,
     subscribe   => [
       Anchor['trove::install::end'],
       Anchor['trove::config::end'],