* fixed inconsistent processing of remaining flows during nDPId shutdown phase
* fixed multiple `detected' flow events
(instead only `detection-update' flow events can occur after a `detected' flow event)
* fixed nDPIsrvd.py invalid message buffer handling
* improved run_tests.sh so only valid pcap capture files are getting processed
(and some more cosmetics + logging)
Signed-off-by: Toni Uhlig <matzeton@googlemail.com>