Allow setting redis timeout via flags/environment. #301
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We're still seeing loads of context deadline exceeded against redis. Looking at our metrics, it seems this is all coming from the MGET calls and I think they might have just too much data to return and they hit the 1s timeout very quickly. This PR adds 2 flags, so we can control, how long we spend on reading and writing to redis. Then we'll be able to experiment with different values.