implementation of IEEE 802.1Qbg in lldpad, part2

Hi,

This series of patches contains the second part of an initial implementation of
the IEEE 802.1Qbg standard: code for the exchange of VDP VSI TLVs between a
host with virtual machines and an adjacent switch.

VDP profiles consisting of mode,mgrid,typeid,typeidversion,instanceid,mac,vlan
can be given to lldpad with lldptool.
A way to deliver profiles to lldpad from libvirt using netlink messages is
currently under development and not yet included in this series.

The profiles are then processed through the VDP/VSI and ECP state machines and
sent out as ECP frames.
ACK frames are received and processed through ECP and VDP/VSI state machines.

It implements a bridge role for a port together with a lldptool command to
switch a port to the bridge role.

The patch applies to lldpad 0.9.34 and still contains code to log low-level
protocol activity more verbosely than it would be necessary in the final
version.

Things that are still missing but planned:

	   - adapt to final ECP ethertype. code currently uses extended
		ethertype (0x88b7) plus OUI.
	   - more testing

Next steps

	   - interface to allow registration of profiles with libvirt
	   - implementation of CDCP

Please review and comment !

Thanks !

	            Jens

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