Fix LS_BUCKET
Fix LS_BUCKET

GET foo.s3.amazonaws.com/ and GET s3.amazonaws.com/foo should result in
an LS_BUCKET request, but under the previous logic it would result in a
LIST_BUCKETS request. GET s3.amazonaws.com/ still results in a
LIST_BUCKETS request due to the 'if path == "/" and s_req.is_path_style'
conditional.

Signed-off-by: Shea Levy <2ad57049e5a4c55c398e1a2fc9bf3e78fb5d7c3a@shealevy.com>

christopherobin/fake-s3,jchristi/fake-s3,PlanitarInc/fake-s3,convox/fakes3,convox/fakes3,ktonon/fake-s3,legitscript/fake-s3,MarcusLongmuir/fake-s3,eikevons/fake-s3,salsify/fake-s3,tkowalcz/fake-s3,liujingbreak/fake-s3,10io/fake-s3,IFTTT/fake_s3,MarcusLongmuir/fake-s3,jchristi/fake-s3,otherinbox/fake-s3,salsify/fake-s3,rutan/fake-s3,liujingbreak/fake-s3,IFTTT/fake_s3,LessPainful/fake-s3,tkowalcz/fake-s3,pilu/fake-s3,PlanitarInc/fake-s3,legitscript/fake-s3,ktonon/fake-s3,publitas/fake-s3,eikevons/fake-s3,otherinbox/fake-s3,rutan/fake-s3,apex-jasonz/fake-s3,publitas/fake-s3,christopherobin/fake-s3,pilu/fake-s3,10io/fake-s3,apex-jasonz/fake-s3,LessPainful/fake-s3