Add new DB schema: sqlachemy and alembic scripts.
Add the implementation of spec(https://review.openstack.org/615462) This patch only contains new DB schema: sqlachemy and migration scripts parts, and still lost object and model api parts of all tables which will be submitted in the following patches. The initial owners of remaining implementation are zhenghao, yumeng and Coco. This patch delete the old unit test of object and api, we will add new unit test once all ovos are ready. Change-Id: I280b093076c8131a2ab2c925d3e050915a28977b
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