Leverage os-vif library for VIF plugging
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hongbin
In Nova libvirt driver, VIF plugging/unplugging has been offloaded to os-vif library. Zun should do the same so that we don't need to maintain the VIF plugging code, which we generally don't have the expertise to maintain.
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Refactor VIF plugging and attaching code
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[WIP] Switch to os-vif library
(?)