Feature proposal: support setting block I/O throttling for vhostuser disk

[jlwang <jinlei_dlut@xxxxxxx>]

Hi,

    blkdeviotune command don't support setting I/O throttlig for vhostuser disk.

    We propose to commit patch to support the feature.

    Are there any issues that would prevent this feature from being accepted?

Thanks,

Wang Jinlei