Evacuate targets wrong host when calling rebuild

[Hans Lindgren]

The target host parameter of the evacuate method is overwritten before being used.

See: https://github.com/openstack/nova/blob/master/nova/compute/api.py#L2441

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22962

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22962
Committed: http://github.com/openstack/nova/commit/10f43aa0bfc6d41282fc19fb4bacddb8bc85ddc5
Submitter: Jenkins
Branch: master

commit 10f43aa0bfc6d41282fc19fb4bacddb8bc85ddc5
Author: Hans Lindgren <email address hidden>
Date: Tue Feb 26 10:53:21 2013 +0100

    Fix target host variable from being overwritten

    The target host parameter of the compute api evacuate method
    is mistakenly overwritten before being used. The result is
    that the instance rebuild operation is tried against the
    original failed host and will always fail.

    Rename locally used variable to a different name and modify
    relevant test to prohibit this from happening again.

    Resolves bug 1133204.

    Change-Id: I517b2dc19d9561723391150105b4943b56dba637