Add a fixture for database update tests
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Reported by: [dcam](https://www.drupal.org/user/1791830)
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<p>Multiple issues that are currently in the Needs Review status update the database. These updates have tests. The tests require a database fixture to be installed. I developed a fixture and I've been copying it from patch to patch. This is eventually going to result in rerolls of the patches. Plus, it's just altogether inconvenient. I want to get the fixture into the module so we can work more efficiently.</p>
<p>I didn't try to set up sample data in the fixture. It will probably need to be added later. For now, just the table structures, configuration, and key_value records are enough for everything I'm doing.</p>
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