Validate correctness of found repositories

[benmss]

The Repo Finder feature makes a best effort attempt to find repositories for artifacts that are missing them. While the meta data used to discover these new URLs is linked in some way to the original artifact, there is still a chance that the found repository is incorrect. Therefore, taking steps to ensure the two are, in fact, the same, would be sensible. This can be achieved via comparison of available meta data in the repository and artifact.