Add libvirt virtual sound card

Registered by Dongcan Ye

In video or game cloud, we will run video or game application in the instance. So the sound card is an important component, but it seems Nova libvirt driver lacks support sound device.

Libvirt supports sound device since 0.4.3. [1]
[1] https://libvirt.org/formatdomain.html#elementsSound

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Dongcan Ye
Direction:
Needs approval
Assignee:
Dongcan Ye
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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