Initial tunnel decoding (GRE - Layer4 only atm). Fixes#53
* make finally use of the thread distribution seed
* Handle GRE/PPP subprotocol the right way
* Add `-t` command line / config option
* Removed duplicated and obsolete IP{4,6}_SIZE_SMALLER_THAN_HEADER which is the same as IP{4,6}_PACKET_TOO_SHORT
* Updated error event schema
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
* The goal was to provide a separate event for extracted feature that are not required
and only useful for a few (e.g. someone who wants do ML).
* Increased network buffer size to 32kB (8192 * 4).
* Switched timestamp precision from ms to us for *ALL* timestamps.
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
