Comment 2 for bug 1055431

Reviewed: https://review.openstack.org/13635
Committed: http://github.com/openstack/nova/commit/25b2062b471c965170d6ad7b0bdf40338e97d330
Submitter: Jenkins
Branch: master

commit 25b2062b471c965170d6ad7b0bdf40338e97d330
Author: Mate Lakat <email address hidden>
Date: Tue Sep 25 16:00:31 2012 +0100

    Fix XenServer's ability to boot xen type images

    Fixes bug 1055431.

    As the scheduler wants to boot a vm_mode=xen type of image, the host's
    "supported_instances" capability is used for finding a good candidate.
    In the Xapi case, this field was not populated.

    This fix modifies the xapi xenhost plugin, so the Xen host capabilities
    are returned back to the compute node, as "host_capabilities".
    On the compute side, the mentioned information is used, to extract the
    "supported_instances" information.

    Change-Id: I2da11ab81f74b5b52e2c30832a694470978e21b0