Add boto test for PUT Object Copy with zero-length
Add boto test for PUT Object Copy with zero-length

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