Hongbin Lu e41c54b175 Refactor VIF plugging and attaching code
This is the first step to offload VIF plugging code to os-vif
library. In particular, this commit moved the veth pair creation
from plug_bridge/plug_ovs_hybrid to attach. This makes more sense
because the veth pair is created for attach the VIF to container.

Partial-Implements: blueprint switch-to-os-vif
Change-Id: Ieaeeeac04a0f92207c6235933ca1040da6da3ffe
2016-12-13 16:51:59 -06:00
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