catalog: remove MockPlan

It wasn't used and didn't do much.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
catalog: update tests to new conventions

See #38.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
catalog: move CreateCatalogSchema under catalog/util

It's not a test.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
catalog: small cleanups in tests

* Make sure to use the Guice injected VersionedCatalogLoader
* Update copyright
* Optimize imports

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>