Drop directadmin suid bit support

Version 1.62.8

Feature
Finished

Starting this version directadmin will no longer support having suid bit set. On update suid bit will be dropped and directadmin will always run under user it was started. This feature essentially removes functionality based around /root/.suid_directadmin introduced in: https://www.directadmin.com/features.php?id=2232 Backwards compatibility for cli call `directadmin --DocumentRoot` were added.

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