XenAPINFS: custom image types are not supported

[Mate Lakat]

# Create a volume from a qcow image

## Step 1. Upload a `qcow2` image to glance

    glance image-create --name qcow_cirros \
    --copy-from=https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img \
    --container-format=bare --disk-format=qcow2

Store the created image id in `IID`:

    IID=$(glance image-list | grep qcow_cirros | sed -e 's/[ |]*//' -e 's/ .*//')

## Step 2. Create a volume based on the image

I will create a 1G image for now:

    cinder create --display_name="volume_from_qcow" --image-id=$IID 1

At this point no exceptions could be seen, volume status is just stuck, and saying "Downloading"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22454

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22454
Committed: http://github.com/openstack/cinder/commit/f2ce6984b7b9a66a88b1b7e0ff319de24f2c78be
Submitter: Jenkins
Branch: master

commit f2ce6984b7b9a66a88b1b7e0ff319de24f2c78be
Author: Mate Lakat <email address hidden>
Date: Wed Feb 13 10:48:34 2013 +0000

    XenAPINFS: Create volume from image (generic)

    Fixes bug 1130706

    Related to blueprint xenapinfs-glance-integration

    This patch enables users to use any images recognised by qemu-img to
    create volumes on XenAPINFS.

    Change-Id: I9dd8ec237309da82ec7f73db1acb48e5b7411c9e