Log Message:
py-dpkt: update to version 1.9.4

dpkt-1.9.3:
 - drop python 2.6 support
 - add python 3.7, 3.8 support
 - fix netbios name encoding and decoding
 - properly set type of last vlan tag to type of eth.data layer
 - fix QinQ vlan tag parsing with miscellaneous data
 - add explicit iter to dpkt.Packet so dict() maps the fields nicely
 - fix ipv6 packet so that it can be used for generating IPv6 data
 - handle zero Eth type
 - python 3 compatibility fixes

dpkt-1.9.0:
 - add support for Python 3.4, 3.5. Python 2.6 and 2.7 are still supported.