qemu: monitor: Sanitize arguments of qemuMonitorBlockdevReopen

qemu: monitor: Sanitize arguments of qemuMonitorBlockdevReopen

Take the virJSONValue array object which is passed to the
'blockdev-reopen' command as the 'options' argument rather than making
the caller wrap all the properties.

The code was a leftover from the time when the blockdev-reopen command
had a different syntax, and thus can be cleaned up.

Also note that the logging of the node name never worked as the top
level object didn't ever contain a 'node-name' property.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>