[MERGE] Move RemoteRepository caching logic to CachedParentsProvider

[Aaron Bentley]

Andrew Bennetts wrote:
> I think this is because it unfortunately isn't safe to cache misses in
> RemoteRepository, because the cache of misses doesn't get invalidated when
> revisions are added to its _real_repository.

I have made miss-caching optional, and disabled it for repository caches.

All tests pass with these changes.

Aaron
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