Migration 017 uses internal swift store classes

[John Bresnahan]

This bug came out of https://bugs.launchpad.net/glance/+bug/1025746. They should be solved in separate reviews therefore they should have their own bugs.

Migration 17 imports and accesses classes from the swift driver and overrides internal functions. This means that the migration code must change with the driver code. These should be separate bits of functionality.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24656

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24656
Committed: http://github.com/openstack/glance/commit/f1804c443b1c8f825e1cf1d01a72de34cde63841
Submitter: Jenkins
Branch: master

commit f1804c443b1c8f825e1cf1d01a72de34cde63841
Author: John Bresnahan <email address hidden>
Date: Thu Mar 21 15:28:46 2013 -1000

    Remove internal store references from migration 017

    Migration 017 was accessing a object internal to the swift store driver
    and changing its behavior in order to do the migration. This worked but
    it made the assumption that the driver logic would not change without
    also changing the migration code. This patch removes all dependencies on
    the swift driver from the migration code. This patch is smilar to
    https://review.openstack.org/#/c/24552/.

    Fixes bug: 1155749
    Change-Id: Iffd800f62d61bf7608f7be5b23d76d702e6d4064