Replace TLS prints with logging

LLDP - support for basic TLVs according to: IEEE 802.1AB-2016

Fix DHCPv6 Relay message behavior

Windows: remove confusing warning message (@gpotter2)

* Python3: fix set_promisc() with Linux

* Fix debug dissector error message

* Make run_scapy3 executable

[IPv6] Windows: fix IPv6 routing + Net6

In order to avoid any conflicts when the consts are changed

This will speed up the boot

Improve VXLAN layer

Try to read the manufacturer DB from various places

Fix DLT_* constant values

[coverage] Full rework of IGMP(v1/2/3) + tests

Improved PR#751

[Python 2 to 3] Bytes fixes