bug 1551701: revert back to Redis 2.x (#5446)
bug 1551701: revert back to Redis 2.x (#5446)


a2sheppy/kuma,mozilla/kuma,a2sheppy/kuma,escattone/kuma,Elchi3/kuma,Elchi3/kuma,SphinxKnight/kuma,SphinxKnight/kuma,SphinxKnight/kuma,SphinxKnight/kuma,mozilla/kuma,a2sheppy/kuma,escattone/kuma,a2sheppy/kuma,escattone/kuma,Elchi3/kuma,mozilla/kuma,SphinxKnight/kuma,mozilla/kuma,mozilla/kuma,Elchi3/kuma,a2sheppy/kuma,Elchi3/kuma,SphinxKnight/kuma