Adopting security/sshguard

rc script passes rclint

Removed clever built-in sysadmin countermeasure:

Previously sshguard would automatically add a line to your
/etc/syslog.conf file. You could activate sshguard by uncommenting this
line. However, every time you reinstall/update sshguard this line will
also be automatically removed rendering the program inactive and your
system unprotected.

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