xenapi: Resize down fails for windows servers

[Souvik Basu]

Resize down goes into error state if it Windows instance, when using the XenAPI driver, and setting auto_disk_config=False for that image.

Found in V2 of Nova Api

[John Garbutt (johngarbutt)]

This is very related to this bug:
https://bugs.launchpad.net/nova/+bug/1188135

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/31952

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/31952
Committed: http://github.com/openstack/nova/commit/1cf78d34830b684a311f0c78d98b2eb189fc4a5c
Submitter: Jenkins
Branch: master

commit 1cf78d34830b684a311f0c78d98b2eb189fc4a5c
Author: John Garbutt <email address hidden>
Date: Thu Jun 6 12:48:49 2013 +0100

    xenapi: remove auto_disk_config check during resize

    This check was introduced by the following change:
    7c5c8a743c21733120c85fdefb84b4357f5848d0

    This is an alternative fix to ensure resize down
    is not processed if the disk cannot be resized.

    Note the failure now registers an instance action
    and does not leave the VM in an error state.

    In addition, this keeps the behavior that a failure
    to resize up and instance during spawn will not
    cause the operation to fail and put the VM into error.

    fixes bug 1188135
    fixes bug 1187934
    fixes bug 1081225

    Change-Id: I5b3dfdc7fcda26c55702dde6cdf191beee0c818c