Initial directory skeleton

Implements: blueprint initial-skeleton
Change-Id: If6559f5e1adf4aee70f5d92b5dfcf9fead86b205
Initial migration for database structure

Created alembic migration script to create tables and populate
lookup table values.

Implements: blueprint initial-db-migration

Change-Id: I9bfa7f62e707571d00f48a0f756d25f4cdd08347
Initial creation of db models, modules, and tests

Added sqlalchemy models mirroring initial migration
Added engine and session methods based off oslo.db
Added base db test based off of oslo.db
Added model tests
Added data models
Added data model tests

Implements: blueprint initial-db-models

Change-Id: I8421093f0952d5e3ef287bfd4979cc5a83af6c09
operator api

Change-Id: I0d91934db47a6e45f0c9ac22089f8689957bd239