[SECURITY] [DSA 2826-1] denyhosts can be abused to block any IP

Users of fail2ban shouldn't lay back, it hits you too [1]:

     logger -p auth.warning -t 'sshd[123]' 'Illegal user user1 from 1.2.3.4'

[1] http://www.fail2ban.org/wiki/index.php/FAQ_german#Was_muss_i...