[coverage] PacketList methods regression tests

Python 3: fix addresses

[Python 2 to 3] Main core fixes + regression.uts

Enable tab completion with fields

Add missing import

[BGP] Fix dispatch_hook beein overwriten

VXLAN: more layer bindings

PR #725 improved

Add next_cls_cb attribute to PacketListField

* Fix warning texts not being printed

* Add legacy style + histfile

* Fix Doc, readme, appveyor

* Add packet fields auto-completion (thanks to @p-l-)

* Pickle, session, interact tests

* Remove trailing line

Replace TLS prints with logging

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