Adds RemoteFX support to the Hyper-V driver

https://review.openstack.org/42529
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/nova" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit a39710244a8f26b0d9d80bffa41c04c84b133f17
Author: Adelina Tuvenie <email address hidden>
Date: Tue Dec 22 17:41:55 2015 +0200

    Adds RemoteFX support to the Hyper-V driver

    Microsoft RemoteFX enhances the visual experience in RDP connections,
    including providing access to virtualized instances of a physical GPU to
    multiple guests running on Hyper-V.

    In order to use RemoteFX in Hyper-V 2012 R2, one or more DirectX 11 capable
    display adapters must be present and the RDS-Virtualization server feature
    must be installed.

    This patch enables RemoteFX on Hyper-V Server / Windows Server 2012 R2
    and above.

    Co-Authored-By: Adelina Tuvenie <email address hidden>
    Co-Authored-By: Claudiu Belu <email address hidden>

    DocImpact

    Implements: blueprint hyper-v-remotefx

    Change-Id: I91fabd5bce2564d48957e8aec1e50ff2625e5747