HUM-998 Improve ring dispersion for an edge case
HUM-998 Improve ring dispersion for an edge case

If you have zones <= # replicas and an unequal number of devices in
those zones, the ring wouldn't optimally disperse the partitions.

nadeemsyed/hummingbird,nadeemsyed/hummingbird,troubling/hummingbird,troubling/hummingbird