While it's true that anybody who's interested in getting
.host-nodes attribute value can just use
virJSONValueObjectGetArray() (and that's exactly what
qemuBuildThreadContextProps() is doing, btw), it somebody is

interested in getting the actual virBitmap, they would have to
parse the JSON array.

Instead, introduce an argument to qemuBuildMemoryBackendProps()
which is set to corresponding value used when formatting the
attribute.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
---
 src/qemu/qemu_command.c | 40 ++++++++++++++++++++++++----------------
 src/qemu/qemu_command.h |  4 +++-
 src/qemu/qemu_hotplug.c |  2 +-
 3 files changed, 28 insertions(+), 18 deletions(-)