Corrected iptables log ID prefix
Fixed the wrong detection of iptables log (resulted in no display of firewall warnings)
Corrected bug in search_iptables_log function: do not trim prefix to only 8 chars, but to 29 - was the cause for misfinding iptables logfile
Bug correction: don't match binary files when looking for iptables log
Merge remote-tracking branch 'upstream/master'