Updated openstack/openstack
Project: openstack/nova  6067fc57a4f92f433a6e8604f79d7149e26917a5
null
Move live migration callbacks to BDM objects

This patch moves the two live migration callbacks _post_live_migration
and _rollback_live_migration to use BDM objects.

As this is the last code that was using _get_instance_volume_bdms helper
method, this patch removes it.

Part of blueprint: icehouse-objects

Change-Id: I904d8b5b58d0ee4ba5a5d836fe3f8a236793f33b