One was also without a placeholder

PHP Deprecated:  substr(): Passing null to parameter #1 ($string) of type string is deprecated in /usr/local/ispconfig/server/plugins-available/bind_plugin.inc.php on line 397

Fixed Uncaught TypeError: array_merge(): Argument #1 must be of type array, bool given in /usr/local/ispconfig/server/plugins-available/shelluser_jailkit_plugin.inc.php:530

Fixed Undefined variable $new_lines in /usr/local/ispconfig/server/lib/classes/file.inc.php on line 126

Fround by: PHP Deprecated:  is_dir(): Passing null to parameter #1 ($filename) of type string is deprecated in /usr/local/ispconfig/server/lib/classes/backup.inc.php on line 1311

This reverts merge request !1

Add all clients to array, use data when needed.

server/lib/classes/system.inc.php
added gentoo specific code to keep symlinks as init script. gentoo uses symlinks to start different php-fpm versions, but "realpath" kills these symlinks.

closes #6414