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This is the first of a series of commits that add the host-aggregates capability, as described on the blueprint page. This commit, more precisely, introduces changes to the Nova model: model classes related to aggregates have been added, as well as DB API methods to interact with the model; a sqlalchemy migration script plus a bunch of tests are also part of this changeset. Commits that will follow are going to add: - Extensions to OSAPI Admin, and related python_novaclient mappings - Implementation of the XenAPI virt layer - Integration of OSAPI and virt layer, via the compute_api - smoketests - openstack-manuals documentation These commits will be pushed for review not necessarily in this exact order. Change-Id: Iceb27609dc53bf4305c02d7cbc436fba4c4a7256