Deckard: use SOCKET_WRAPPER_PCAP_FILE facilities

Custom implementation of packet logging was replaced by
SOCKET_WRAPPER_PCAP_FILE facilities. The main advantage is that it logs
all the traffic including malformed packets, ICMP messages and so on.

As side-effect, this commit removes depedency on Python package dpkt.
3 jobs for pcap
in 46 seconds and was queued for 3 seconds