remove standard_io option from getopt:usage call
remove standard_io option from getopt:usage call

eper's version of getopt does not support it

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