[libvirt] [PATCHv4 0/3] Transport Open vSwitch per-port data during live migration

This is an update of Kyle Mestery's patch series v3 by the same name: https://www.redhat.com/archives/libvir-list/2012-October/msg00014.html I've updated it according to the comments in the review of patch 1/3 of that series: https://www.redhat.com/archives/libvir-list/2012-October/msg01224.html It now needs a counter-review from Kyle, along with verification that it actually works (since I don't have the proper setup to test it handy). ****************************************** This series of commits has the end goal of allowing per-port data stored in the Open vSwitch DB to be transported during live migration. This is done by first providing a generic infrastructure for transporting network data, adding some utility functions specific to Open vSwitch, and hooking the two together. The framework provided is generic in that other networking data could be transferred as well by simply adding in additional hooks as needed. Kyle Mestery (3): Add the ability for the Qemu V3 migration protocol to include transporting network configuration. A generic framework is proposed with this patch to allow for the transfer of opaque data. Add utility functions for Open vSwitch to both save per-port data before a live migration, and restore the per-port data after a live migration. Transport Open vSwitch per-port data during live migration by using the utility functions virNetDevOpenvswitchGetMigrateData() and virNetDevOpenvswitchSetMigrateData().