Remove imageutils from oslo-incubator and move to using imageutils in oslo_utils

[Ivan Kolodyazhny]

Cidner should not use imageutils from oslo-incubator

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/247480

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ivan Kolodyazhny (<email address hidden>) on branch: master
Review: https://review.openstack.org/247480
Reason: It will be moved to oslo.utils: https://review.openstack.org/#/c/249107/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/290875

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/290875
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=388a131c3dd720939a1fa697a8b54a1a33457f64
Submitter: Jenkins
Branch: master

commit 388a131c3dd720939a1fa697a8b54a1a33457f64
Author: Jay S Bryant <email address hidden>
Date: Tue Mar 8 05:22:39 2016 -0600

    Remove remaining oslo-incubator code from Cinder

    Most of the parts for oslo-incubator have moved to
    oslo libraries. Cinder only had imageutils.py and
    _i18n.py remaining in cinder/openstack/common. I
    was to able remove both of these remaining incubator
    components.

    oslo_utils now has imageutils available. I moved
    cinder/image/image_utils.py to use the new
    imageutils from oslo_utils and updated all the other
    places that were using the old imageutils import.

    _i18n was only being used in scheduler/base_filter.py
    which appears to have been accidentally left when the
    scheduler was previously pulled out of incubator. I
    fixed this oversight.

    Finally, this patch deletes cinder/openstack/common
    cinder/openstack and the openstack-common.conf file.

    Change-Id: I8fe0b5d6c278715620f93f682289df7ae60dbeba
    Closes-bug: 1517861