Deny anonymous GET Service requests
Deny anonymous GET Service requests

Fixes CS330

Anonymouse service-level requests should be denied to avoid
unnecessary error messages trying to list the buckets owned by an
undefined user.

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