Add database tables and migration manager

This commit adds the Job, TestCase and Result tables for the database and include the migration manager script.

It also adds a new run-qa-report script that will be used to properly handle the postgresql database connection during startup to make sure it is available before executing the main qa-report app.

The commit also updates the Dockerfile to include the netcat package.

Signed-off-by: Luis Araujo luis.araujo@collabora.co.uk