New csf v4.39

Changes:

• Updated csf.conf to clarify that LF_PERMBLOCK_COUNT and LF_NETBLOCK_COUNT with act if more than the number of hits are detected, not on the exact number set
• Modified csf WHM UI to use csf -u to upgrade csf when a new version is available
• Added new script /etc/csf/csftest.pl which will test the servers iptables modules for functionality. The tests are for the required iptables modules and the optional modules for the SMTP_BLOCK, PORTFLOOD and MESSENGER features. This adds a useful diagnostic tool for kernel/iptables problems and to check whether the features above will function
• Added csf WHM UI option to run csftest.pl
• Updated the csf install.txt to run csftest.pl before running up csf