[libvirt] number of graphic device in vm xml is limited to only 1

[Huangyong]

Hello,

         In qemu_command, vnc graphic device can’t be more than 1, as the following code show in qemuBuildCommandLineValidate():
         If（sdl > 1 || vnc > 1 || spice > 1） {
                   virReportError(….);
                   return -1;
}
This check originally introduced by commit: 6fe9025eb.
Qemu: Error on unsupported graphics config

qemu can support multi-vnc-configuration in qemu process, but libvirt limit vnc graphics in only 1.
Is there any considerations in libvirt? can remove this restriction?

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