* Adapt test_queue to harvest source datasets
* Don't use the same mock harvester on different datasets as it messes
the tests up
* Skip auth tests for the time being
`harvest_source_create` and `harvest_source_update` now call
`package_create` and `package_update` respectively, making sure to
define a 'harvest_source' type. The returned dict uses the db_to_form
schema.