Does replica support actually work?

[dave-shawley]

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Using tredis in production, the client did not handle a failover of an AWS ElasticCache item. I believe that https://github.com/gmr/tredis/blob/master/tredis/client.py#L654-L655 should have handled this yet it did not. Adding an HA Client (see #3) is probably the correct solution here. Cluttering up the basic client is probably a bad idea.