add small buffer read test
add small buffer read test

PivotalRD/libhdfs3,PivotalRD/libhdfs3,Pivotal-Data-Attic/pivotalrd-libhdfs3,PivotalRD/libhdfs3,Pivotal-Data-Attic/pivotalrd-libhdfs3,Pivotal-Data-Attic/pivotalrd-libhdfs3