Signed-off-by: Neale Ranns <nranns@cisco.com>

[Python 2 to 3] Fix overwritten imports (small)

[FF] Fix file format in the scapy project

[Appveyor] Add Npcap installer

[Python 2 to 3] Exceptions, loops, isinstance and haskey

[General] Update licenses & Contrib flags

Better winpcap/npcap control: scapy is now able to detect the offline
service and start it manually

[convergence] map() calls rewritten as list comprehensions

Fix typo in troubleshooting.rst

(or its equivalent on other systems that Linux) => (or its equivalent on other systems than Linux)

fix nsh len field init

Since MDType default value is 1, set Len defautl value to 6

Also add a post_build function which sets the len value to len(pkt)/4

fix scapy tests accordingly

Support (in contrib) for MQTT (Message Queue Telemetry Transport) protocol, with tests.

[coverage] More tests for inet.py

Modify information about sr() and fuzz()