xenapi: console for rescue vm is broken

[Sulochan Acharya]

For xenapi when a vm goes into rescue mode and one requests console
get_vnc_console is called ... which passes the original instance to get the
ref. The instance that it should be calling has "-rescue" name label, so
rescue vm never gets the console.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24822

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24822
Committed: http://github.com/openstack/nova/commit/e136de1aea8d1469465272942fa3d2769cbe3a80
Submitter: Jenkins
Branch: master

commit e136de1aea8d1469465272942fa3d2769cbe3a80
Author: Sulochan Acharya <email address hidden>
Date: Tue Mar 19 15:05:27 2013 -0500

    xenapi: fix console for rescued instance

    Check if the instance is in vm_state RESCUED and if so
    change the name-label to reflect that. Name label is used
    to get vm ref and currently the original instance is being
    referenced even when in rescue mode. If rescue vm is not ready
    yet, InstanceNotReady is raised.

    Added tests cases for xenapi get_vnc_console for instance
    and rescue mode.

    Fixes bug #1157389

    Change-Id: I5438103d517c40c1c87ddecd5f88b1487bfc0339