qemu: Release reserved VFs if they can't be attached.
qemu: Release reserved VFs if they can't be attached.

Signed-off-by: Steve Hodgson <shodgson@solarflare.com>
(cherry picked from commit 901da7501bfde3824c29f90f42718d32aeb43d48)

Conflicts:

	src/qemu/qemu_driver.c

sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-