Implement the minimal changes to the local filesystem storage driver and feed them through the distributed storage driver.
Create a digest package which contains digest_tools and checksums.
Fix the tests to use the new v1 endpoint locations.
Fix repository.delete_instance to properly filter the generated queries to avoid most subquery deletes, but still generate them when not explicitly filtered.
This fixes the issue whereby attempting to pull a public repository as an authenticated user with anonymous access disabled caused an unexpected 401. This change also adds tests for a few other use cases to verify we haven't broken anything.
