adds code to generate data for upgrade test

[keith-turner]

Adds a disabled integration test that will generate data for an upgrade test. This is intended to be used manually in the following way.

1. Checkout version 3.1.x
2. Run UpgradeGenerateIT which will generate instances test/target/upgrade-test
3. Checkout version 4.0.x
4. Run mvn package (not clean)
5. Run UpgradeIT which will upgrade and verify the instances in test/target/upgrade-test

UpgradeIT does not exist in this commit, its added in #4719