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
Initial creation of repository classes and tests

Change-Id: I7b21ea82a01ae677b2cfeaa0afb01230a4894257
Implements: blueprint db-repositories
Implementing simple operator API

Setup executable to use wsgiref.simple_server
Simple setup of pecan
Defined controllers that defin the API resources
Defined the wsme types that define the resource response and request bodies

Implements: bp/operator-api

Change-Id: I0d91934db47a6e45f0c9ac22089f8689957bd239