[libvirt] [PATCH 0/6] Introduce a new migration protocol to QEMU driver

The current migration protocol has several flaws - No initial hook on the source host to do work before the dst VM is launched - No ability to restart src VM if dst fails to recv all migration data, but src successfully sent it all This introduces a new 5 step migration process to address this limitation. To support features such as seemless migration of SPICE clients, and lock driver state passing this now makes use of the migration cookie feature too