[inferno-vc] Cached client and server logging. More granular cache locks. Cleanup #143
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This PR adds logging to cached client to see hits/misses and makes the thundering-herd-prevention locks more granular while only taking the lock when actually fetching upstream. Also does some cleanup in that module so the thundering-herd-prevention logic is easier to inspect and functions have names that better describe what they do. This is 3rd take of #139 but this time the semantics of fetchVCObjectClosureHashes is not modified