Change version info on mainline to 2.0

Change-Id: Idef34527dbb1fffef472669352ed98fffcd217b4
Change default configuration file of contrail daemons to enable
local logging at SYS_NOTICE level
Closes-Bug: #1373177

Change-Id: I8e0b3090675b79ed7b8e400a6104f065d878356e
Initial support for FreeBSD platform:
- ethhdr structures have been replaced with ether_header
- icmphdr structures have been replcaed with icmp
- iphdr structures have been replcaed with ip

All above replacements have been done to make the code common
with the BSD.

Change-Id: I8554ab3017714e30b406dfdd0a40799de9c0a9a4
Authors: Grzegorz Bernacki, Michał Dubiel, Dominik Ermel