- fixed backups not downloadable on multiserver slave, fixes #4973

- fixed accidently deleting mysql r/o user completely when it is removed from a single database, fixes #4963

The background of this MR is, that you may rollout multiple PHP versions to a server but not all should be started automatically. As long as not at least one valid conf is given, the process won't start. So you have the posibility to give your customers more PHP versions to select w/o having each PHP FPM master started, what may be a big memory consumption w/o any kind of advantage. Or better said, it may be a disadvantage on smaller VMs with just 1-2 GB RAM when there are already running 4-6 FPM masters which may consume up to 200MB w/o doing anything.

Fix bug where in a multiserver setup, deleting a backup will not remove its details from the master database as well.

Make traffic quota datas available for template

Fix typo in parent user related variable when creating new jailkit shell user. This bug was interfering with the correct functioning of the plugin.

+ fix php-fpm chroot

every cron execution. The logfile can be disabled by using -NoLog