qemu_driver: use qemuMonitorQueryStats to extract halt poll time
qemu_driver: use qemuMonitorQueryStats to extract halt poll time

This patch uses qemuMonitorQueryStats to query "halt_poll_success_ns"
and "halt_poll_fail_ns" for every vCPU. The respective values for each
vCPU are then added together.

Signed-off-by: Amneesh Singh <2f64eb72c3446c437166284784d36a4a2a2e703b@weirdnatto.in>
Reviewed-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt