Added a pusher that sends data in the CEF format to syslog

[maxdebruijn]

Here is a pusher that sends the logging of honeytrap to a syslogserver in the CEF format.
It can be used to integrate the output of honeytrap in a SIEM that supports the CEF format.

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[nl5887]

Hi Max, that's an awesome addition. Today I don't expect to have time to look at your PR, but will this weekend. Thanks!