Add a way to re-sync mail DNS records

Also, make restore resync the admin domain record which gets messed
up by the dns setup

src/setup.js

@@ -313,6 +313,9 @@ function restore(backupConfig, backupId, version, callback) {
             async.series([
                 backups.restore.bind(null, backupConfig, backupId),
                 autoprovision,
+                // currently, our suggested restore flow is after a dnsSetup. This re-creates DKIM keys and updates the DNS
+                // for this reason, we have to re-setup DNS after a restore. Once we have a 100% IP based restore, we can skip this
+                mail.update.bind(null, config.adminDomain()),
                 shell.sudo.bind(null, 'restart', [ RESTART_CMD ])
             ], function (error) {
                 debug('restore:', error);