xenapi: finish_migrate should not inject the hostname

[John Garbutt]

There has been work to ensure the hostname is only injected just before boot, and removed once the agent is active and completed configuring everything.

The Windows PV tools pick up this hostname and ensure that a VM has the correct hostname. However, if the key is left in place, users will be unable to rename their servers.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/39977

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/39977
Committed: http://github.com/openstack/nova/commit/74c2a260efeb56b0d3d4b61fe6f9f8c10532bc82
Submitter: Jenkins
Branch: master

commit 74c2a260efeb56b0d3d4b61fe6f9f8c10532bc82
Author: John Garbutt <email address hidden>
Date: Fri Aug 2 17:29:56 2013 +0100

    xenapi: stop injecting the hostname during resize

    The windows PV tools will set the hostname of a server to the value
    given in the hostname xenstore key. If we inject that during resize, the
    users will be unable to change their server hostname, and in addition it
    will be reset to the original name.

    Fixes bug 1207829
    Change-Id: I49ba9d9f4f8b4a86488e427d99f69236bd959c78