refactor riak_cs_utils:create_user/2
refactor riak_cs_utils:create_user/2

laurenrother/riak_cs,sdebnath/riak_cs,laurenrother/riak_cs,GabrielNicolasAvellaneda/riak_cs,laurenrother/riak_cs,yangchengjian/riak_cs,basho/riak_cs,basho/riak_cs,GabrielNicolasAvellaneda/riak_cs,dragonfax/riak_cs,sdebnath/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,yangchengjian/riak_cs,basho/riak_cs,yangchengjian/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,laurenrother/riak_cs