CI: database install tests should start with an empty database
Some databases require an explicit CREATE DATABASE statement, while other Docker images already provision an empty database.
CI: Database tests shouldn't use hardcoded file paths
Instead of hard-coding the location of Openfire's source code, this location should be provided to the application.
Additionally:
- Use the location to generate a mock 'OPENFIRE_HOME' directory, that can be used to both:
-- Read and write property files used by the update runner
-- Retrieve the database scripts that are being tested by the update runner.
- Close the database connection after use
OF-3045: SchemaManager explict check for success
After SchemaManager runs database upgrade scripts, it should not assume success, but explicitly check for it.
