vyatta-iproute's iproute2 version doesn't match kernel version in current branch.
We should use v4.4.0?
Working branch: https://github.com/higebu/vyatta-iproute/tree/440
Testing packages: https://github.com/higebu/vyatta-iproute/releases/tag/debian%2F4.4.0-1vyos2
mpls testing (verification of new feature): https://gist.github.com/higebu/415e5862659ff5620e0b