Add initial updated files for alembic.
Add migration files
Merge branch 'verify-resource' of https://github.com/jfwood/barbican into verify-resource
Restore validators back to original state;
Fix temp code that should have been removed.
Alphabetize imports on the db migration script.
Added logic to handle new tables vs existing tables scenarios.
Fix issues brought up via CR review.
Merge pull request #617 from jfwood/verify-resource

Revive database migration logic;