Fixed
* Crash when syslog-ng was restarted by Nikola and log was send to it by
  Nikola

Changed
* Executable renamed from `nikola` to `sentinel-nikola`
* Python package renamed from `nikola` to `sentinel_nikola`
* Cron now runs shell script that checks if EULA was approved as well as
  if Nikola is enabled before running it.
* Syslog-ng now filters packets with DROP fate as well as REJECT