Update BareMetal driver to current nova.network.model

Update baremetal driver and vif to use classes from
nova.network.model instead of legacy "network,mapping" tuple.

Partly implement blueprint nova-network-legacy

Co-author: Amir Sadoughi<amir.sadoughi@gmail.com>
Change-Id: Ia66360f51e1d7a12273df2a080931958cc4f86b5
Merge "Update BareMetal driver to current nova.network.model"