ml2: make get_device_details report mac address as well

Change-Id: Icaa26448a370dd75d09e95ed439df5b486a862cf
ofagent: bye bye br-tun

WIP

Implements: blueprint ofagent-merge-bridges
Change-Id: I21ee1c6d141863182b487e10c7bfe911b1a472ab
ofa_neutron_agent: l2pop_network_types

Change-Id: Id5ed1d40c8a4adbaadf88da4e1d497b358def5bb