[libvirt] [PATCH 0/6] qemu: add suport for "romfile", and associated cleanups

[Laine Stump]

This patchset started out as cleanup to make it easier to add in
support for doing PCI passthrough via the <interface> element (to be
used to attach a host network device to a guest after performing some
network-device-specific setup), but turned out to also make it much
easier to add support for QEMU's "romfile" option, as requested in 
https://bugzilla.redhat.com/show_bug.cgi?id=781562

Patch 1 is trivial, and probably qualifies for pushing under the
trivial rule, but it's just as easy to leave it in with the
rest. Patches 2-4 reorganize some data definitions, and the code
associated with them, with no functional change. Patch 5 expands
support for "rombar" to network devices (as long as they attach to the
guest PCI bus), and Patch 6 adds support for "romfile" to both generic
PCI devices and network devices.