Clean up db.instance_get_all_by_host() in NOVA api

[Daniele Casini]

Currently, both db.* and objects are used. This patch replaces all db.* with objects (prefered solution).

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/133761

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean Dague (<email address hidden>) on branch: master
Review: https://review.openstack.org/133761
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[Davanum Srinivas (DIMS) (dims-v)]

Removing "In Progress" status and assignee as change is abandoned.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/164132

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/164132
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=5660899fc11055566f2dd495d35c016b4410ea10
Submitter: Jenkins
Branch: master

commit 5660899fc11055566f2dd495d35c016b4410ea10
Author: jichenjc <email address hidden>
Date: Tue Feb 24 18:52:22 2015 +0800

    Code clean up db.instance_get_all_by_host()

    Replaces db.instance_get_all_by_host()
    with objects.InstanceList.get_by_host()
    also, fixed several unit test cases fail by using
    mock to replace stub.

    Closes-Bug: #1390483

    Change-Id: I7da701f37d162f97b924cb8eede76de4f1c8bf7a