Support set vgamem for video

Registered by Liyingjun

We can set video.vram by setting hw_video_ram in image properties currently [1], but can't set vgamem. The default vgamem is 16MiB, it's not enough for 4k resolutions in some cases. [2]

[1]: https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L4170-L4177
[2]: http://www.ovirt.org/documentation/draft/video-ram/

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Liyingjun
Direction:
Needs approval
Assignee:
Liyingjun
Definition:
New
Series goal:
Proposed for pike
Implementation:
Started
Milestone target:
None
Started by
Liyingjun

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Gerrit topic: https://review.openstack.org/#q,topic:bp/support-vgamem,n,z

Addressed by: https://review.openstack.org/438787
    Spec for support set vgamem for video

Addressed by: https://review.openstack.org/411191
    libvirt: Enable custom video vgamem setting

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