Reconnect after CLUSTERDOWN dials wrong host #1276

redis部署bug问题解决：CLUSTERDOWN Hash slot not served error clusterdown hash slot not served CLUSTERDOWN Hash slot not served Once the cluster was fully reconfigured, we then had some services stuck on these errors : dial error slot 在搭建版本的集群环境曾出现各节点无法互相发现与Hash槽分配异常CLUSTERDOWN Hash slot not served的情况，故而把解决方式记录下来。

error_ draggable element must have an item slot CLUSTERDOWN Hash slot not served Using 7 in Mac OS X How about run the redis-cli -c -p 6379 cluster info to check the cluster and hash