Add APIv3 support to make host optional on evacuate.

[OpenStack Infra]

https://review.openstack.org/88750
commit 6ca97b1cc1019e5f43e72001f89a1305f8317557
Author: Leandro I. Costantino <email address hidden>
Date: Thu Feb 27 09:08:32 2014 -0300

    Add APIv3 support to make host optional on evacuate.

    DocImpact: The evacuate target host is now optional. If
    'host' field is not sent in the request, the scheduler
    will determine the target host. This will include
    nova client changes ( on the proper commit ) to support
    this new optional parameter.

    Implements: blueprint find-host-and-evacuate-instance

    Change-Id: I907ea4ef39cfad50a48cb80bceba217fdf482f6e
    Co-Authored-By: Juan M. Olle <email address hidden>
    Co-Authored-By: Andres Buraschi <email address hidden>
    Co-Authored-By: Anuj Mathur <email address hidden>
    Co-Authored-By: Navneet Kumar <email address hidden>
    Co-Authored-By: Claxton Correya <email address hidden>

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/205009
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=2240d10567952cc5565c5285ce32062c8f3e5962
Submitter: Jenkins
Branch: master

commit 2240d10567952cc5565c5285ce32062c8f3e5962
Author: Hironori Shiina <email address hidden>
Date: Thu Jul 23 11:40:52 2015 +0000

    Add parameter list to "Evacuate server" API (v2.1)

    This patch adds a parameter list to "Evacuate server" API. The main purpose of
    the patch is indicating the 'host' parameter is optional.

    Change-Id: I2cd7e1646c7bde5a7cb66281bb266c0cdcda3633
    Closes-Bug: 1346189