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Ensemble_ring_changes tests writing a value, expanding the cluster, then
updating and reading that value after ring expansion has completed. It
also creates a bucket using a bucket type with a different n_val from
the default bucket type. The latter tests basho/riak_kv#1008 and it's
corresponding riak_core PR.
Additionally it tests replacing and force replacing a single node at a time to ensure reads and writes still work.