Hyper-V: wrong constant name causes volume attach to fail

[Lucian Petrut]

This patch https://review.openstack.org/#/c/107177/ changed a few constant names, among which _DISK_RES_SUB_TYPE to _DISK_DRIVE_RES_SUB_TYPE.

Because of a mistake when rebasing this patch https://review.openstack.org/#/c/129235/, the old constant name was used in the vmutils.get_attached_disks method. This causes volume attach to fail.

Trace: http://paste.openstack.org/show/151021/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/141655

[Alessandro Pilotti (alexpilotti)]

Can please post a stack trace?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/141655
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=59322cd0f0c9f9e92d1bd81b864e3a2f9f92f116
Submitter: Jenkins
Branch: master

commit 59322cd0f0c9f9e92d1bd81b864e3a2f9f92f116
Author: Lucian Petrut <email address hidden>
Date: Sun Dec 14 18:36:41 2014 +0200

    Hyper-V: Fix volume attach issue caused by wrong constant name

    This patch d5ca918af4124216e4435fdc28c9180f996e4036 changed a few
    constant names, among which _DISK_RES_SUB_TYPE to
    _DISK_DRIVE_RES_SUB_TYPE.

    Because of a mistake when rebasing this patch
    0e02db2980dc4e76ef7949ba4ec131af9fc4a44d, the old constant name
    was still used in the vmutils.get_attached_disks method, causing
    volume attachment to fail. This affects both v1 and v2 namespaces.

    This patch fixes the incorrect constant name and adds the missing
    unit test for this method.

    Change-Id: I373c687ce401129fc368bd074a859161d1813902
    Closes-bug: #1402403