Add delay before restarting services after upgrade

install/upgrade/restart.sh

@@ -15,6 +15,7 @@ for user in `ls /usr/local/hestia/data/users/`; do
 done
 
 echo "(*) Restarting services..."
+sleep 3
 if [ ! -z $MAIL_SYSTEM ]; then
     $BIN/v-restart-mail $restart
 fi