rkhunter – fix warnings

Warning #1

Warning: Found enabled xinetd service: /etc/xinetd.d/ftp_psa
Warning: Found enabled xinetd service: /etc/xinetd.d/poppassd_psa
Warning: Found enabled xinetd service: /etc/xinetd.d/smtp_psa
Warning: Found enabled xinetd service: /etc/xinetd.d/smtps_psa
Warning: Found enabled xinetd service: /etc/xinetd.d/submission_psa

Rkhunter and plesk xinetd services

Warning #2

Unable to find 'lsattr' command - all file immutable-bit checks will be skipped.

https://sourceforge.net/p/rkhunter/mailman/message/33159245/

Warning #3

No output found from the lsmod command or the /proc/modules file

https://sourceforge.net/p/rkhunter/mailman/message/20285811/

Warning #4

Warning: The SSH and rkhunter configuration options should be the same:

https://unix.stackexchange.com/questions/194087/rkhunter-warning-about-ssh-root-access-when-that-access-is-not-allowed-on-the-sy