Prefetch trial state in a single Redis roundtrip#753
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This is part of an effort to reduce the burden of N roundtrips and drop the need of a cache impl.
Trial#choose! reads an experiment's winner, start time, version, and cohorting flag on every ab_test. This batches all four into one pipelined roundtrip.
No change in behavior, just making all calls at the same time. 4 redis calls are reduced to a single one here.