use debug not warning log level for cluster id not obtainable
use debug not warning log level for cluster id not obtainable

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