Init repo from seabios-1.7.3.1-2 src rpm

https://dl.fedoraproject.org/pub/fedora/linux/updates/20/SRPMS/seabios-1.7.3.1-2.fc20.src.rpm
Add new files added by src rpm
Apply patch in src rpm

Fix kvm migration with empty virtio-scsi controller (bz #1032208)
Add spec support