Note: checked in as a working cluster in the hope most others don't have
to:
ruby redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001
127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
(and need ruby, etc.)