Create API interface for Queue Callers

Right now we are using the sqlalchemy backend, until we build out the
redis model. We also remove any redis dependencies, since we don't
actually use it now.

Change-Id: I0fca1387cc9d4fc4348fa0bc141a41cd7c8ed339
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>
Properly display license header in source files

Change-Id: I570793398bbd1bbbbedafc9e37d83a4f29b8678f
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>
Move to alembic for database migrations

Change-Id: Iaf040428dc3f18b53fb2f775e7216308ff76f178
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>