New csf v5.02

Changes:

• Added new options X_ARF, X_ARF_FROM and X_ARF_TO which allows sending X_ARF reports (see http://www.x-arf.org/specification.html). See csf.conf for more information
• Added new options SMTP_ALLOWUSER and SMTP_ALLOWGROUP so that users and groups that can bypass SMTP_BLOCK can be easily added. These default to the original values previously hard-coded
• Modified SMTP_ALLOWLOCAL to use the loopback device (lo) instead of 127.0.0.1 to cater for multiple loopback devices and allows connection to locally configured IPs as well
• Modified lfd code to ignore any 127.0.0.0/8 address not just 127.0.0.1
• Added new option CLUSTER_LOCALADDR to send out cluster requests on an IP other than the default IP
• Added lfd check to enforce 0600 permissions on /etc/csf/