Resolves: bz#627585
(Improve error messages for bad options in -drive and -device)
Resolves: bz#644919
(RFE: QMP command to trigger an NMI in the guest)
Resolves: bz#699635
([REG][6.1] After executing virsh dump with --live option and the completion, the subsequent virsh dump command to the same domain behaves abnormally)