Create BanLister.py

BanLister was written to collect the syslog files from my WatchGuard Fireboxes and Cisco ASA/Router/Switch environmnet.  I use a syslog server to collect logs, and based upon "Deny" or "Scanning" or other criteria I forward the log from syslogd to BanLister's UDP interface running on port 11514.  SolarWinds and Kiwilog work well with this.  I also recommend Dave Kennedy's Artillery script to feed into the IP ban list as well.