add debhelper to debian dependencies
add debhelper to debian dependencies

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