Allow REDIS_CLUSTER environment variable to use Redis in cluster mode #2377
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Using a Redis cluster instead of a single host allows for a more high-availability deployment.
This patch is only allows a single seed host. A more full implementation would have some way to support multiple seed hosts (eg a comma separated list, or multiple environment variables). However, this is enough to get started and works well in environments that have a single name/IP that will connect to a redis cluster (eg a load balancer or a kubernetes service).