Comment 4 for bug 1055431

Reviewed: https://review.openstack.org/14088
Committed: http://github.com/openstack/nova/commit/96136435f13936574a67955fbca9134ceb565df2
Submitter: Jenkins
Branch: stable/folsom

commit 96136435f13936574a67955fbca9134ceb565df2
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