Support specify USB controller for USB-passthrough

Registered by Jing Yuan

If users want to use a USB 2.0 device, it may need to specify a appropriate USB controller like ehci for it.

So I think its necessary for nova to support function of specify USB controller when create VM with USB device.

Blueprint information

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

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Gerrit topic: https://review.openstack.org/#q,topic:bp/usb-passthrough-with-usb-controller,n,z

Addressed by: https://review.openstack.org/88337
    Support specify USB controller for USB-passthrough

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