Hyper-V doesn't boot instances from volume with ephemeral disk

[Adelina Tuvenie]

Instance boot from volume fails in Hyper-V if flavor has ephemeral disk. Boot fails with the following error:

"HyperVException: WMI job failed with status 10. Error details: Failed to add device 'Physical Disk Drive'."

This happens because Hyper-V tries to attach both the ephemeral disk and the boot volume to the same slot on the IDE controller.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/207113

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/207113
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=f2d58900575d3718f4004db129599f59ae8c3854
Submitter: Jenkins
Branch: master

commit f2d58900575d3718f4004db129599f59ae8c3854
Author: Adelina Tuvenie <email address hidden>
Date: Wed Jul 29 09:04:52 2015 -0700

    Fixes Hyper-V boot from volume fails when using ephemeral disk

    Instance boot from volume fails in Hyper-V if the flavor has ephemeral
    disk.

    This happens because Hyper-V tries to attach both the ephemeral disk and
    the boot volume to the same slot on the IDE controller.

    This fixes the bug by making sure that the ephemeral disk will always
    attach to the second slot.

    Change-Id: Id6772b75683528db765241d21e25fba55358afb7
    Closes-Bug: #1479129