Add syncronized setup of worker threads.

The main thread waits now for the setup of the worker threads before
continuing

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add a stop method to the traffic server.

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add more documentation

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add a unittest to test basic worker communication

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>