Includes a bit more docs/comments cleanup. We should eventually
document the events further but it should suffice for now.
* topic/robin/dnp3-merge-v3:
Tiny bit of cleanup and adapting the new test.
added a test case for dnp3 packets with only link layer
added condition to check DNP3 packet without app layer data
Fixing well-known port.
Pluginizing the DNP3 analyzer, plus a basic script logging requests and replies.